GNOME Desktop users can put this in a Bash script in ~/.local/share/nautilus/ for more convincing looking fake PDF scans, accessible from your right-click menu. I do not recall where I copied it from originally to give credit so thanks, random internet person (probably on Stack Exchange). It works perfectly.

  ROTATION=$(shuf -n 1 -e '-' '')$(shuf -n 1 -e $(seq 0.05 .5))

  for pdf in "$@";
    do magick  -density 150 $pdf \
              -linear-stretch '1.5%x2%' \
              -rotate 0.4 \
              -attenuate '0.01' \
              +noise  Multiplicative \
              -colorspace 'gray' \
              "${pdf%.*}-fakescan.${pdf##*.}"
  done