Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d1e659b688d2f1…

MALICIOUS

PDF

96.3 KB Created: 2021-06-30 19:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8171489a8e58afb72cc044c6d55fbd9 SHA-1: d046fe356792e23cb914dbad1308ecbb903bc7f0 SHA-256: 61d1e659b688d2f1428eb8693723b652dd29f820a5f372f79ebd68fac46fef00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://infrive.ru/uplcv?utm_term=other+words+for+most+importantly
    • https://alice-immo.com/userfiles/file/limumaropudukivazed.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6e2b1edc274f1189339705e888a458f0/naxaxolubavek.pdf
    • https://arte-salon.ru/upload_picture/3469701207.pdf
    • http://robalton.es/Albums/images/file///bexixore.pdf
    • https://amblamy.ee/upload/file/11901779291.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/s58juqqsiq54oohvqlqcs961ls/17091272626.pdf
    • http://littlepearlbooks.in/data/eimages/file/manadujotenesuwojanozeja.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/deie747c3aui2ok3b9p66g4kr3/87746270307.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf18d2e2d0---julufanigafowodibetuki.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rg5d06fsdpgfvfa2rl7skp2ig3/11061111474.pdf
    • http://fatamorgana.fr/uploads/assets/file/69470070230.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b5a3fc05c8e55999eee14cb164a92079/52005797242.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/01h24klblmjsgectjho262ejn3/riwit.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc16364073---64410139210.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e5bbdac47682fae0e43a9d3853a76e73/taxozusubamupin.pdf
    • http://sbs-group.co/userfiles/files/22595413539.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/psfqmmk87gun10c218ahuquvip/53457576542.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fmbsqpd0hh31gufautnn4l4im0/36127914599.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607369c9d1f94---xumarafakisubojenigo.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987cd0ec898---bimitokoxedawevise.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e7795b42ab1c9abf19e878646d1203de/doditolukilorejov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 16792 bytes
font_01_sfnt_off00012bff.bin
37cf725cc80d0c8ae23c3d3274b63aa5e8a81ceb9abdf993bfd1e80a0f7731d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 10988 bytes
font_02_sfnt_off0001456c.bin
38414d6413725fd64334afdcaba03b8396dccef4e7a75c99e0638fd282a221ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456C 17304 bytes