As indicated by muru, there is a way to get updated packages for Debian 7, through Freexian’s Extended LTS. See also Raphaël Hertzog’s blog post introducing it.
This is a continuation of the Debian 7 LTS, which stopped in May 2018. In the extended LTS, a subset of Debian 7 packages continue to receive support, on
amd64 and possibly
i386. The subset is determined by the sponsors of the project; to be an extended LTS sponsor, you also have to be a regular LTS sponsor. It is however possible to hitch a ride and use the extended LTS without sponsoring it, the instructions and repository are freely available:
wget https://deb.freexian.com/extended-lts/pool/main/f/freexian-archive-keyring/freexian-archive-keyring_2018.05.29_all.deb && sudo dpkg -i freexian-archive-keyring_2018.05.29_all.deb
echo deb http://deb.freexian.com/extended-lts wheezy-lts main contrib non-free | sudo tee /etc/apt/sources.list.d/extended-lts.list
echo deb http://deb.freexian.com/extended-lts wheezy-lts-kernel main | sudo tee -a /etc/apt/sources.list.d/extended-lts.list
Remember to upgrade the kernel too, and set up a local package mirror.
Without becoming a sponsor, this can only be a band-aid and the resulting feeling of security will be misleading. For example, Ghostscript was dropped at the start of September...
(Freexian handles sponsorship and payments. The package maintenance is carried out by Debian developers whose time is paid for by the Extended LTS project.)