A breach through wordpress made it possible for intruders to spread a compromised version of Linux Mint through the official website.
And that's why you shouldn't use wordpress.
Check out the comment sections of the link, you'll get the confirmation there.
How to check if your ISO is compromised?If you still have the ISO file, check its MD5 signature with the command “md5sum yourfile.iso” (where yourfile.iso is the name of the ISO).The valid signatures are below:6e7f7e03500747c6c3bfece2c9c8394f linuxmint-17.3-cinnamon-32bit.iso e71a2aad8b58605e906dbea444dc4983 linuxmint-17.3-cinnamon-64bit.iso 30fef1aa1134c5f3778c77c4417f7238 linuxmint-17.3-cinnamon-nocodecs-32bit.iso 3406350a87c201cdca0927b1bc7c2ccd linuxmint-17.3-cinnamon-nocodecs-64bit.iso df38af96e99726bb0a1ef3e5cd47563d linuxmint-17.3-cinnamon-oem-64bit.isoIf you still have the burnt DVD or USB stick, boot a computer or a virtual machine offline (turn off your router if in doubt) with it and let it load the live session.Once in the live session, if there is a file in /var/lib/man.cy, then this is an infected ISO.
If you download Linux Mint recently, please read the announcement closely.
Via [Linux Mint Website]