Remove P7M signature from files with openssl

First, cd to the directory you want to process:

cd C:\Users\ciccio\files

openssl.exe cms -decrypt -verify -inform DER -in file.pdf.p7m -noverify -out file.pdf -binary

Don't forget -binary. Without, your output file (PDF?) will be corrupted.

Batch operation

cd [target_folder]
for /r %i in (*.p7m) do openssl.exe cms -decrypt -verify -inform DER -in "%~ni.p7m" -noverify -out "%~ni" -binary

Sign P7M file with openssl

openssl cms -sign -outform DER -binary -md sha256 -in document.pdf -out document.pdf.p7m -signer your_priv_certs.crt.pem -inkey your_priv_certs.key.pem -noverify -nodetach

Batch operation

cd [target_folder]
for /r %i in (*.pdf) do openssl cms -sign -outform DER -binary -md sha256 -in "%~ni.pdf" -out "%~ni.pdf.p7m" -signer your_priv_certs.crt.pem -inkey your_priv_certs.key.pem -noverify -nodetach

ImageMagick Crop Image and assembly into PDF

You can screenshot automatically and assembly a png result using for example screenshot captor.

magick.exe convert -crop "805x1214" input.png cropped_%d.png
magick.exe convert -page a4 "cropped_*.png" -quality 100 outfile.pdf

Winscp

Replace putty.exe with Windows Terminal using tabs

wt.exe  -w 0 --title !N plink.exe !U@!@ -i !K -P !#  -t "cd !/ \; /bin/bash --login"