I stumbled upon this malware blocklist, and was surprised how well documented and categorized it is.
An example would be:
Malicious or purchaseable domains found in videogame manuals and title screens
In another category I noticed a website of a good old Linux distro, which has been discontinued, and now listed as bad
Mandriva . dot com
Here is the list in a “host file” version but just for your information, I don’t think it could be used in this form with IPfire.