: Likely a tag for the specific encoding group or a shorthand for the release team.
In short, this is a released by the World4uFree group. world4ufree-cfd-tekhi-chutny-p01-hevc720p-mkv
: This refers to the source website or the "uproader" group (World4uFree) known for distributing movies and television shows. : Likely a tag for the specific encoding