/usr/share/kconf_update/webengineurlinterceptoradblock.upd is in kdepim-addons 17.12.3-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Id=webengineurlinterceptoradblock_move_settings
File=kmail2rc,webengineurlinterceptoradblockrc
Group=Reader,General
Key=AdBlockEnabled,AdBlockEnabled
Key=HideAdsEnabled,HideAdsEnabled
Key=AdBlockUpdateInterval,AdBlockUpdateInterval
|