It’s a photograph of a physical page that has been converted to black and white and had the mid-tones and dark-tones darkened, probably to compensate for the bottom of the page being lighter in the photo than the top.
This is why you have that odd situation of the text on the previous page bleeding through on that one spot - it’s just at the threshold and is being darkened disproportionately compared to the rest.
I have to take photos of documents for work every now and then and hit these exact same issues when cleaning them up.
As for the blank page - I think it’s just a wide margin. If you zoom right into the top corner, you can just see a few black pixels where the text is starting.
Bum science, specifically…