It’s not “domain parking” – that is when you simply register a domain and put it somewhere, usually for sale, like Sedo (.co.uk) or Afternic, undeveloped.
My guess is you clicked one of the sponsored links in Yahoo. Looks like someone has set up PPC with their affiliate tag in place to redirect to PP.
The alternative is cloaking. The page may detect the source of the click and if it comes from one place, goes to A and if the referrer is another goes to B. This can be used legitimately but in this cae is what they call “Black Hat SEO” and likely to cause more problems than it solves!