Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a07a0306f047a8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 13:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b31109a9411d581cd12f2a5bec7d55a5 SHA-1: e8871c7bb0990c85a56cc7d4d444214d439d1f4b SHA-256: c9a07a0306f047a816f7edc660aef8566743fb9c30475f9a6f65fad469eac279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through the linked sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=newspaper+headlines+ks2+worksheet PDF link annotation
    • http://albatrossmrn.com/konadnew/userfiles/file/13696763833.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/89941226128.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2626b964---vodigizubixulabe.pdfIn PDF document text
    • http://teplospectr.ru/images/files/61433249139.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/318970265303f0b2d1fbd75724e0182a/75259140370.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/terupi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fcfa81c873cf04d81b61628dee2671dd/wikifaziveramewoxerefo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/poretaroteriwofigo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab880b1e463---revikizamubip.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/3572616858.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f90d20a920c428c225356225cb885ac7/59471320271.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/13566195164.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/bizuxomoterifede.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077037bcea4e---pobigugapetidezadupen.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/negewuzumipuze.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nofufupuramisaroxe.pdfIn PDF document text
    • http://didula.com/img/file/86516698972.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dc12a75b---xoxinemedagopisojomutu.pdfIn PDF document text
    • http://alteanetworks.fr/img/file/48748800832.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/danibasidobexovenukekot.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/43657219098.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2bvhm66ilqt85luma93somk1q3/natasexotogora.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vrpk3a7r49hc902mromh3om536/80054624677.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17992 bytes
SHA-256: 3f460c4f6df3e9ffd06f152d70f77d400ece0dae5455e0c6507dd7b99b00f6e7
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 10764 bytes
SHA-256: aaef745d6565d76954ec4f76adf521f559bfe89c529b5b6c9721305a4d2828aa

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