Nearly all the UK's favourite movie and TV piracy sites "contain malware or credit card scams", according to a study published by the media industry.
It analysed 30 of the most visited sites offering access to copyright infringing material, and indicated only one was free of such threats.
The police have praised the group for raising awareness of the problem.
But other experts said the research was "misleading" and an exercise in "scaremongering".
Fake buttons
Intelligent Content Protection (Incopro) - a consultancy specialising in anti-piracy services - was contracted to do the research.
It accessed pages listing the top five films and top five TV shows on each site over the fortnight beginning 4 April.
The firm said 20 of the surveyed sites featured credit card fraud and other kinds of scams, in which users might be asked to provide personal details to access content that was not as it appeared.
It added that malware and other "potentially unwanted programs" were found on 27 of the sites. It said these were most commonly triggered by a user clicking on what appeared to be a "play" button that actually carried out another function.
The most popular type - reportedly found on 10 of the sites - were pop-up ads that the authors said were annoying in themselves and could also be used to fool the user into installing other types of malware.
It said five of the sites contained rootkit malware, which could be used to modify the computer's settings so that its anti-virus protection was switched off and the machine used to secretly send spam or mount cyber-attacks.
There were no discovered cases where a pirate site automatically downloaded a malicious program without a link being clicked.
But one of Incopro's researchers said the sites benefited from the fees and other "kickbacks" paid by ad networks that place the icons and texts used to lure users.
"These fake play buttons, and that sort of thing, are very much driven by the desire of people to download content," Helen Saunders told the BBC.
"We view it as a kind of social engineering attack on the users who are tricked into downloading this stuff."
The Industry Trust also published details of a survey that questioned 4,210 UK-based pirate site visitors.
It said 77% of the respondents reported they had downloaded malware or other unwanted material as a result of using an unauthorised site.
'Ethically questionable'
The trust is advising the public to use its own Find Any Film service to find where to rent or buy legal material.
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