Malicious PDF — malware analysis report

Static analysis result for SHA-256 931894cab08efe04…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 08:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3268dc6b521ae0e0e667dc3dbc938029 SHA-1: 9044517aa6feef3afdc372c0392c9a0121f67108 SHA-256: 931894cab08efe049321149fe8cd01d1cf01bc9496854b8dd2d7cc48e17c011a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The document contains numerous links to potentially compromised WordPress upload directories, suggesting it may be part of a larger phishing infrastructure. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eea63c309---99882905847.pdf In PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jazoxexazilito.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vaxazofobobalegudum.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/xujazib.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/65090957135.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210924061900756.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/49045005420.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/47080851240.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/17216815100.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n204t945ajmdlhpjcma8556j20/30292029268.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94101498487.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/82907361437.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/89885990111.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/gatinovuro.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/71067802343.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/wedala.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/xakutunatav.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nk68m3e9tmajfhvvfe3li6cgv0/kibepalukigatosoxesuxivas.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/revejot.pdfIn PDF document text
    • https://felicityokolo.com/file/7230033242.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/woraxuve.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vonidibapikazo.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/rezufevimi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8af24f52---mipopuvefasome.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/zipefugipowutibegukav.pdfIn PDF document text
    • https://dm288.rs/slicice/file/95957249771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+baumgartners+plus+one+epubPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 18692 bytes
SHA-256: 3462a8f36ca7b568c48475641c980eb86de2e904cb7ab12b44e9956090cb51d1
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 10808 bytes
SHA-256: c167e6cdec205e386f1e24c17098b5fd576573a9fa872dcc4d0589be221eb8b5
font_02_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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