I've two pdf documents certified (signed and validated with the same mechanism based on Itext 7 ) and when i use adobe reader DC to check their validity, only one has the green mark.

the good one:
<https://1drv.ms/b/s!AkF6t4TavwMvgxWaidlUqvPvHH1r>

the bad one:
<https://1drv.ms/b/s!AkF6t4TavwMvgxQCMdGY61S1EvUh>

Regards 

David L