Unless the Moderators also have administrative privileges, the UKW will continue to drift in spam shark infested waters. I've seen this happen on other discussion boards, and eventually the spam attacks become so overwhelming, the options are to abandon the website, restore from a known good backup (assuming any exist), or shut down the site. Unless the site has a full-time staff, volunteer Moderators can do only so much.
The current version of UKW software is at least ten years out of date, as is TheWoodHaven2, which is an eternity in spamming methods and techniques. There could be many reasons for this, such as apathy from the owner, an end of life server and OS that won't run newer versions of supporting software, or a combination of the two plus many more.
When I was an owner/administrator for a photography website using vBulletin, I discovered one morning that there were over 2,500 new member accounts, each with at least a dozen posts with spam links in every forum and sub-forum. The accounts were easy to spot because each had a gibberish email address and the attack method to create the account bypassed the email notification requirement.
I had to shut the site down, restore the database from the previous day's backup because it was too much work to cull the spam, and find out how the spammers were able to launch such an assault on the website. Once the vulnerability was discovered and fixed, I turned the site back on. I installed a new recommended addon that was effective at the attacks and logged each successful block. There were still over 2,500 attempts to create spam accounts each day as well as over 200 direct attacks to the server, mostly from China and Russia. Fortunately, the mod_security rules were effective at blocking the server attacks. I eventually leased a new server and changed the discussion board software to XenForo, which is more stable and inherently more secure than vBulletin or phpBB.
The Moderators have my utmost respect and I hope you have the access required to install security patches or perform other maintenance to keep UKW alive.