User-agent: *
Disallow: *.pdf  # Block pdf files. Non-standard but works for major search engines.

User-agent: GPTBot
Disallow: /

User-agent: Amazonbot
Disallow: /

User-agent: barkrowler
Disallow: /

User-agent: MJ12bot
Disallow: /

User-agent: SemrushBot
Disallow: /

User-agent: crawler_eb_germany_2.0
Disallow: /

User-agent: echobot
Disallow: /

User-agent: DataForSeoBot
Disallow: /

User-agent: AhrefsBot
Disallow: /

User-agent: BLEXBot
Disallow: /

User-agent: Yandex
Disallow: /

User-agent: PetalBot
Disallow: /