fathom - 7:57 am on May 24, 2013 (gmt 0)
I agree with what atlrus said yesterday (I posted to the same effect last year): Penguin 1 was both page- and term-specific.
I have one specific internal (fourth-level) page that was obviously affected for its subject-term. It has a large number of unsolicited backlinks using the term as anchor-text, and I am as sure as I can be that this is the reason for its disappearance from Google SERPS. It was on Google page 1, and is still on page 1 of all other engines.
But you're assuming that only link recipients were the target(s) of PENGUIN 1.0.
Let's assume for the moment Matt Cutts is correct that PENGUIN 1.0 only targeted the homepage of domains... how can your fourth level page be impacted?
In a link network that uses say Wordpress all the heavy link juice links to you are conveniently on the homepage (as a default setting even if it paginate to page#2 or page#10) thus PENGUIN naturally deals with your sub-page from the other side while still only targeting the homepage.
We don't discuss it but I can't fathom why Google would devalue link recipients and ignore link generators (or maybe they cover both ends and domain owners that offer links are reluctant to discuss the selling of links or don't notice the issue for what it is).