Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef67926c026eea3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 22:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0623405ce5d7cb1c79638e27e83a838 SHA-1: 5a99b927e2db1de1e17346054f6d643a64ba38cf SHA-256: 1ef67926c026eea3a18468a1825b143364d6a8b1311a1263d30dfb2b23fbc031
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=how+to+transfer+photos+from+pc+to+phone PDF link annotation
    • http://kiajihlava.cz/UserFiles/File/87581891895.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/44546302804.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/48475294078.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/33252896521.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161304ce5e5447---70600160051.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/kewobunulojapebegedafoje.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908145810.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091105094373499.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/mukoxakexejebepaturipij.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/31757769824.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/79314346909.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/70966874804.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/vimubolisamanilinagimet.pdfIn PDF document text
    • http://salt17.com/userfiles/files/vapiwoto.pdfIn PDF document text
    • http://showdoimovel.com/files/files/taloganorinavirujopa.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kolizudanuvuvabakurit.pdfIn PDF document text
    • http://badgerhillfarm.uk/bexipegisabujoxuru.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/61168217085.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/xanidelizuzikuwoputadupi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe0681572---66983614955.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a1cf95e17716dfc5f4d5419b028e6ba3/tigazugidafubiwamikuxaj.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/melozasaredozami.pdfIn PDF document text
    • http://theponghop.com/upload/files/29733728020.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16900 bytes
SHA-256: 1ce32fda7bffcd9a1f8a50b7af88cdef5f0fa51168f9375883e0df23701435c0
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10684 bytes
SHA-256: beed3eb0c6ac67442f5fcd0a54b816c1e8184d5c18decd2cfc69ed561434ea2c
font_02_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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