My Google search has come up pretty dry as well.
I suggest you drive out to State College, PA and use that as your "base camp" since it's a beautiful college town. Bald Eagle and Rothrock State Forests are within 15-40 minutes of State College and offer some unspoiled virgin natural areas. I've been to some parts of Rothrock where it was so tremendously quiet from the lack of human intervention, I was shocked.
What you want to look for is something on the "Mid-State Trail". I found sites peddling maps, which might be a nice thing to have. I think the trail is over 100 miles long and it's mostly on public land, like the Appalachian Trail. The AT segment in PA isn't supposed to be anything great, so I suggest you look into the Mid-State Trail instead.