If you are trying to exclude the event 4625, then you should not use whitelist.
Whitelist will include the following pattern.
Comments from documentation - https://docs.splunk.com/Documentation/Splunk/7.2.5/Admin/Inputsconf#Event_Log_whitelist_and_blacklist_formats
" * Example:
whitelist = EventCode=%^200$% User=%jrodman%
Include events only if they have EventCode 200 and relate to User jrodman
"
Just try to use Blacklist if you want to drop EventCode 4625.
Maybe try
blacklist1 = EventCode="4625"
or
blacklist1 = EventCode="4625" Type = "(Information)"
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