Malicious PDF — malware analysis report

Static analysis result for SHA-256 266e9e91ed0e81d4…

MALICIOUS

PDF

93.4 KB Created: 2021-07-25 01:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: df3853380506d92a0f4a4e8d5308ba2e SHA-1: b0f4bb1e7b73b95b2e41d7414e7f68049b32c30c SHA-256: 266e9e91ed0e81d42051a868b69bd34cf4ea50172ad9b44411b034e256ef27c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6c4ddd62ec18654b3923942b49444280/86371401717.pdf In PDF document text
    • http://www.hydro-tg.pro/upload/file/moxarepowuzafutawijogapo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c7b7d3545c2df2807fd94ad2050e437b/8975609842.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ab777c4dda25223f6d909622fc2fad2b/2070008995.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e3b77a88---82133144333.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58d9c6a60---zibelibodabidoxodaxe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/47c02533c364e0ab26d1624d93b2152a/93871358000.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/45817561017.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/72117443599.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c483023d87---3944165535.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0cb6df3e006b63a6d7818b2320abcd03/55271759774.pdfIn PDF document text
    • http://billsky.ee/files/file/71449598971.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed5e29d35---bijiluxuputevewepis.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062511052733097.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc44878b00---63283228966.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fajapek.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/moduna.pdfIn PDF document text
    • https://panama4d.com/contents//files/regiraredujobopaxu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7305e1ca78---belonupafevipejije.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607932f06c8ac---80978381405.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/12229678391.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/6759273474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=diono+radian+3+rxt+manual+canadaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17244 bytes
SHA-256: 2526d521834d42c67b86e89321846daf11c96508959da4e589070c3b3b76d0c4
font_02_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 10608 bytes
SHA-256: aa5babccbd88ddff7f502732ed8a99f6be647b013a41674535768f8b7e49eb21
font_03_sfnt_off0001505c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 16076 bytes
SHA-256: 9dc74535a6692f4260f0355970fcc7bc2a5c5af40b851cc3ce6f07945a46146e

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