/usr/lib/x86_64-linux-gnu/libldap.so is in libldap2-dev 2.4.28-1.1ubuntu4.6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libldap_r.so
/usr/lib/x86_64-linux-gnu/libldap_r.so