Because these sites are illegal, they don't use secure HTTPS certificates properly. They rely on:

Many .exe files disguised as .mkv. Even media files can contain embedded scripts when opened with vulnerable players (e.g., old VLC versions). Popups on these sites often install adware.

Worldfree4u is a notorious public torrent and direct download website. It specializes in three things:

When users search for “worldfree4u 300mb movies best hot,” they want a curated list of the most trending, recently added films that won’t take up storage space.