Why not. Easy money.
The tricky bit is what its "sufficiently transformative" to gets its own copyright. Probably simply text printed in a book is not, so I think you'd be OK scanning and distributing such a book. But if the publisher added new footnotes or illustrations or cover art or a forward, etc, that would still be covered under its own copyright and you would have to remove them. And I could see an argument that a certain printing style (maybe a choice in font or page layout?) could be transformative, but I think that starts to be quite a stretch.
OT, but isn't it called "foreword"? You're the second person in this thread calling it "forward" which means something completely different to me, while "foreword" is basically a literal translation of the word for it in my native language.
A publisher would only have a copyrightable claim in their original creative works. So the cover art, the foreword, etc. This would also include e-books, as the specific code for that would be copyrightable illegal to download. Only the words themselves would be free, so you would need someone to create a gratis file therefrom for you.