Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2f9fa656f1dcde…

MALICIOUS

PDF

95.3 KB Created: 2021-08-15 08:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d6fdb74ccce91a5188d388caa825b3a0 SHA-1: a443537a850867831229cefb0c5770dd67582c59 SHA-256: db2f9fa656f1dcde646a097ac50ba6885ba2cc81df0dc64dbdead6e76e29656b
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=what+are+revenue+codes+for+medical+billing PDF link annotation
    • http://classicalgardenstatues.com/uplds/file/jewidetojuguluxojos.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/lizarisedukovokanujazumef.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0e38ac06866892c9fb67d0309d984096/87845281245.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e461d8bea80---nijoduzamifisufogux.pdfIn PDF document text
    • http://dd-eng.com/files/files/52493337927.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/poxavugek.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b3ssjog0rcn5q7fl7vcs7ek7q2/ralidemu.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/42819261756.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/jawakom.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/99338510378.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dcde1845a---wagixubef.pdfIn PDF document text
    • https://priscar.com/documents/files/gitegaxatuv.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1b26ac945ad7255cba10c7d0819dc5ec/lokiwojidatexoni.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/99989660487.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/42748850817.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/40791415989.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/41340329596.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/50291907765.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/996fme2bo0394b83e2b5dk3il4/tilavoxasewomovejo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/27614816501.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/a623d63441f62a811c79813d09c95641/97028491351.pdfIn PDF document text
    • http://altus.pl/userfiles/file/13084163955.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/98836088078.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_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 17016 bytes
SHA-256: 3e593646a000c7dfbedf227ac5843e51350f79d19c508f071e7060ac68548893
font_02_sfnt_off0001553b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553B 11220 bytes
SHA-256: b18a12a2566214e603ff6b572c025c795d942f8960f103215b3cee9cb8f44b39

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