Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a06cb93f2857628…

MALICIOUS

PDF

72.3 KB Created: 2021-06-25 13:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ca37ca10b18cfefe477c1398c611e31 SHA-1: 5601c41eef80f409c48f75586fa74a6b1038e656 SHA-256: 7a06cb93f285762829203756c49156991e04007bf33478ff60782b11af08625e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7122

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1e74610816ca58420e8d26db11b4d417/nobusukevitumigex.pdf In PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lorojukivadugudivinek.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c942f03976---90977668973.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a689ea4e5d---zovovibotitisaxakaruwu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf2a4edf3---nixagupelufabebupo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c207f681eea0b249fcf3d5f9383e0d2/96541643847.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c418290ae0742f73277ccdfafcd16dc0/45289415802.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/dotuxamodejagujatigisapiz.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/towazabujawetu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b96095e7---98962565477.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160705b62279ad---bumoxapiwasegujapimuvudap.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076cac564b4a---43594516930.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/ruzulomatatolasebusulaz.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/zuvodekajonama.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc0b62e5f0---kuboxubisabirelezugaxopol.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/55765335410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=considerate+of+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 22876 bytes
SHA-256: 088b9c3f40f128c7de2db8199662bcb580eefe4df95fd2abed150020f808077a

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