So it makes me wonder if those QR codes are actually my wallet, or maybe they are just the blocktrail pubkeys as third party of the 2-3 signature
I tried to search but no clues if the QR code there is yours or not.
Why not try to contact the support? The pdf backup file contains email and support secret numbers you can provide it to them and ask if you can able to recover your old wallet that generated a P2PKH address.