Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c982484b42f051…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 13:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c58b90289934fe70a1551006eb28c513 SHA-1: 1247dac65791e61477ac033e5562d2bb9bb8439c SHA-256: d6c982484b42f051942dd7bcbfc15bdda3a59e8d2d692bdf93682f315631f253
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The 'SE_MFA_LURE' heuristic confirms the document's intent to harvest credentials by tricking users into approving MFA requests or entering one-time codes. Numerous URLs were extracted, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://okna-kurska.ru/page_edit/_samples/userfiles/files/67345217032.pdf In PDF document text
    • https://lesura.net/userfiles/file/26396066144.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/vageretipifusajug.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/35617399697.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/lodop.pdfIn PDF document text
    • http://vswet.ru/f/vosejirusokijas.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/85457579766.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rawejozajopajejofa.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/wivuwexejo.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/riwajomadoweroso.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/timunis.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rezilatunelidob.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/vipobazeji.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/53a63da6abea3e5132055aa38ddebb91/16283369873.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/934452c3a31d5c6996d4310932444bd2/badizugisusi.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xevujopikisowo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca2b8b67e.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13e8c12eb3ec417dcfb9300c67f8e7bf/veramuji.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jevufujimopexotalajaxe.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/72711132910.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m3k1edvbo01dq8nvm7j8897o80/53361909.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/segitigokupe.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///kenajazizimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apple+airprint+androidPDF 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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 16244 bytes
SHA-256: 8aa92131aa928547b9fcc3d0e3813a91f53819b4e118c960d4a994e0557b80c2
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10196 bytes
SHA-256: b83e2c8bf28f4a98f6341cf00cb49faea41819c3d692ff2d5ff4fa3e4433fc3c
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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