Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a0d11e05a60cf0…

MALICIOUS

PDF

147.4 KB Created: 2021-07-29 23:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4643bb9c5de019cbcf28fa70f14c8d4 SHA-1: ca4904b204dabaaefe879bd02192e01d8c1e4320 SHA-256: b3a0d11e05a60cf025b0da5129154112edd09d967bcfa2c3be46ecc7878fee7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is flagged as a link farm pointing to potentially compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing or SEO-poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9445

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://drafthe.ru/uplcv?utm_term=definici%C3%B3n+de+empresa+libros+pdf PDF link annotation
    • http://www.logomarcanet.com/userfiles/file/lisaravumodagi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tajosa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d8236b316---laganolerafutifudab.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b9a723b0961a6988d9910ec5f6997a0f/50056027600.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/detakixobumos.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/sidekitazilujigoju.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/mowodewenolemipesive.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/22045347747.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c542b421a---32097796117.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vefqg0642toouo3oecsm0c5b68/35222101622.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052915223073499.pdfIn PDF document text
    • http://roocenter.ru/upload/file/37929328059.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d4463644---zeniziwazuguminub.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vuxinivatudisatulapob.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/43552809082.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/35fqtgqr8anshd067jl7ls56i6/gikagedudododiwovus.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/86697986761.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a672560ec08---90547399677.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/57118701598.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6863454f5c35ed8e66af31062a675cec/30053708393.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/de3738b8294bbfb2ac0871666dae67b1/zusobitesewilikizibafo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0f96eb05---74721604219.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/75333407764.pdfIn PDF document text
    • http://ellev.fr/upload/files/jenozumepuvidojujade.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAA2 10964 bytes
SHA-256: 252db40f59bdc9e01ef22afa031043747a5c53e5b6401992818976980682f04e
font_01_sfnt_off0001f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B92 19012 bytes
SHA-256: e76ec14650dd9660469b68efb03d15311264b890a400b49b9067f959e08660c0

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