Malicious PDF — malware analysis report

Static analysis result for SHA-256 c571d54c9684fb72…

MALICIOUS

PDF

72.1 KB Created: 2021-06-25 12:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6af873d1e613ac1407e1657b528eef84 SHA-1: 85e654f583b54bfd115085f6f13e6c4ee0e0ca12 SHA-256: c571d54c9684fb72b3d1dec958b06ebfe971e52ffc47bd53de9c2d6b1a92873a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=converter+pdf+html
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/9cb3bebb3a7ebebaf86c0401b2af3a82/vipimeger.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f7b373fbd482c3e6af4de01d500eedcc/lefelo.pdf
    • http://bielwod.com/userfiles/file/kugupotezaposidekuruwari.pdf
    • http://accessiblevehicleservices.com/userfiles/file/92918601314.pdf
    • https://pestresolution.pt/site/upload/file/13399418730.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec61d1cc8---44151694238.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3512b906c---vabafa.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608224923b767---73724676396.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/828fac8e4b54defe3fdcc5be29d7745e/bawukukowipawekuzi.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3c27d9d746ec6808d022acfa5ca92778/52622502587.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2993b0f2c8---kexodo.pdf
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/72185062516.pdf
    • https://stallion-international.com/userfiles/file/92676731047.pdf
    • http://aggengr.com/uploads/CMS/file/38013722496.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0280d2b639006c0d25b278bc09a5f8ae/60971990374.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_off0000b9d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 16792 bytes
font_01_sfnt_off0000d1ed.bin
af9619b48bb0ac5b9883ad6efc0351e646d2fbd11485edb186b749c836d4b98d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 10436 bytes
font_02_sfnt_off0000e963.bin
5a019fac7188bd31b120dbbf24163be5ac7c5329e5b72a363e6a9c4a309dce52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16644 bytes

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