Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff1722db3be2cc2…

MALICIOUS

PDF

146.0 KB Created: 2021-07-05 08:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82ba88b860133bfdacb0baf50dad521c SHA-1: f206e5cc14768676bd665e8510fe1c0984820c41 SHA-256: fff1722db3be2cc215c12af88e80893a217384a045fc75ba2cad66f88be1f133
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or SEO poisoning attempt. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests malicious intent by leveraging compromised infrastructure. While no scripts were extracted, the nature of the links and the PDF structure suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4903

Heuristics 4

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sahyadrisevasanstha.in/userfiles/file/wevuwekasibujunodaduna.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5947ef1795---wojipanuxiva.pdf
    • http://allaboutdowney.com/userimages/gipiron.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vgf9j4gdhmt7c0b04eqf5jkmh5/79650380288.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097a764bb72b---80282923336.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/toi60reom6eq6miadup993oi96/nezewimoba.pdf
    • http://boathousebrokerage.com/userfiles/file/30677840190.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc10cef2---25959751209.pdf
    • http://sparkpro.lv/content/file/54269849922.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0f7c2c9ffac2f823c29e296a9db2eb50/35047573996.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd2fce691---zakevosifekivovatuvo.pdf
    • http://vom-ragnaroek.de/uploads/file/88617390843.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d5ndkm6tk33d2lmnklh49shvnn/bunuvisididarazizumup.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095d265deb05---68951849836.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef24c6e11---30148100299.pdf
    • http://atomleasing.ru/media/File/tebuwukibuparufinisu.pdf
    • https://airflow-skateboards.com/upload/file/34685393171.pdf
    • http://tamlaproject.com/userData/board/file/93884712470.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160985a98cb2a6---zekevaluvuvak.pdf
    • http://bosch-service-center.ru/uploads/files/belezedimadofux.pdf
    • http://barudan.hk/UploadFile/file/20210620073528968.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/67a15cf9323f97128434e70a7bca6fd3/69196956149.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+angle+which+is+equal+to+its+supplement+is
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f5b2.bin
07801dc98b562fefaa272e6adf97db3be8cc6c928a405b70334cf506156978e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5B2 17796 bytes
font_01_sfnt_off0002244e.bin
2671b51f92fd3ac43d2d9e74e89da24538159edc345f6d628b22db5a63f1c4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2244E 11016 bytes

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