Archives like this are frequently re-uploaded on file-sharing sites with malware (such as keyloggers or stealers) hidden within the .rar or disguised as one of the ebooks.
These "leaks" were often compiled by forum members who felt that many of the "premium" ebooks sold in the HackForums "Marketplace" or "Secondary Sellers" sections were recycled or "garbage" content. By bundling 150 of them into a single .rar file, users aimed to devalue the paid products and provide the community with free access to the methods. Current Relevance and Risks 150 Hackforums E-book leak.rar
Most technical methods (such as specific software exploits) are now patched and non-functional. The monetization methods are largely saturated or against modern Terms of Service (ToS) for major platforms. 150 Hackforums E-book leak.rar