We have found 2 software records in our database eligible for .spba to .vcf file format conversion.
The only program that can recover or export data from .spba files is Samsung Kies, so this is the software you need to use if you want to export the contacts from the backup file and save it as vCard file, which is what spba to vcf conversion essentially represents.
However, you may need a particular version of Kies and some later ones may not support previously used and later discontinued formats.
SPBA
Files with spba extension are in most cases special contact list backups from Samsung Phones made using the Samsung Kies software.
VCF
Files with vcf extension are almost always contacts saved in vCard format. Typically used various Personal Information Managers or e-mail clients (for example Outlook), as well as exported from mobile phones, for the purposes of sharing or migrating contacts from one device to another.