@hotftuna Looks like the pr may be derived from a 301 redirect of this domain (sd-taishan.com) pointed towards links legend. sd-taishan.com was on some asian mountain and has a strong link profile pointing towards it from many asian language sites. Guessing that sd-taishan.com was a pr 6 prior to the 301 being put in place. Not judging it to be a good or bad practice but the pr on linkslegend is probably real derived from that redirect and the site does have pr on internal pages.
I am no expert regarding fake page rank so I will go with those who may know better. Only reason I checked with rankchecker is that there did not see like there were many inbounds to the home page for PR5.
Please check for yourself before making conclusion: http://www.rankchecker.com/pagerank-checker/#linkslegend.com, OK?
Thanks for realizing your mistake. Most of the people don't even bother to rectify what they have done wrong.