pfx2pvk

openssl pkcs12 -in SOMETHING.pfx -nocerts -nodes -out SOMETHING.key

pvk -in SOMETHING.key -topvk -out SOMETHING.pvk

openssl pkcs12 -in SOMETHING.pfx -nokeys -out SOMETHING_CERTS.pem

openssl crl2pkcs7 -nocrl -certfile SOMETHING_CERTS.pem -outform DER -out SOMETHING.SPC