If after pasting you can not move using the arrow keys or select and move it, then you can create a new transparent image - matching final dimensions - place signature in the final position and paste this image into PDF.
Hi R, I'm sorry, I did not get it right, I understood that you could not drag, just paste! :P
I can't paste into PDF also, I think it is not possible.
Open PDF, save as another kind of file, paste as you need and save as PDF again, if your PDF have more than one page you can use PNG format that has this same option.
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