Movie CPA Parasites sharks

This is sick, how do they manage to takeover subdomains of high DR websites like these?

http://www.unlocked.microsoft.com/mov/video-super-mario-bros-mov-hd.04.html (lmfao, this won't be around long, archive for posterity: https://archive.is/z7rSh)
https://www.fmtf.fire.ca.gov/mov/videos-super-morio-bros-movie-plex_dis.20.html
https://mpc.berkeley.edu/video/video-the-super-mario-bros-movies-on-watch-hd-link.06.html

These are all probably hacked and since hacking discussion is prohibited on this forum, nobody will give you an answer.