.vcf ist ja nur reiner Text. Hier ein einfaches AppleScript, das alle Photos entfernt

• Code in den Script Editor kopieren und starten
• Quelldatei auswählen
• Die neue Datei wird als contactsWithoutPhotos.vcf auf dem Desktop gesichert. Die Originaldatei wird nicht verändert.

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set vcf to choose file of type {"vcf"}
set destination to {}
set theSource to paragraphs of (read vcf as «class utf8»)
repeat with i from 1 to (count theSource)
  set aLine to item i of theSource
  if aLine does not start with "PHOTO" and aLine does not start with space then
    set end of destination to aLine
  end if
end repeat
set {TID, text item delimiters} to {text item delimiters, (return & linefeed)}
set destinationText to destination as text
set text item delimiters to TID
set targetFile to ((path to desktop as text) & "contactsWithoutPhotos.vcf")
set fileDescriptor to open for access file targetFile with write permission
write destinationText to fileDescriptor as «class utf8»
close access fileDescriptor