Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d909f7c454c97f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09eb0a64c53ebfdedc9864d22815b748 SHA-1: 1ad20a9b9fb747dbd411b24521bae3c09906789c SHA-256: b2d909f7c454c97f95d920ac3a0c4afea464e05e57c83072a09c5d41044363f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=toefl+online+preparation+pdf PDF link annotation
    • http://avandcie-automation.fr/ckfinder/userfiles/files/27825034240.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/lisiro.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c5a243092---73856263677.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce60e16b86---3142538553.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102d3e913055---24812068561.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/razifevamizipozawetoluw.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/41688591607.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/19642044928.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/dawatemepeb.pdfIn PDF document text
    • https://majubesar.info/contents/files/37823982993.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607950dd1df4e---30945709208.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec521f824cd0793ce9aa36813ac5b0fe/34820648465.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vuzane.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/47818214616.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7599db4f3f---minarufuratuxizoxajoboj.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/05b38043bdb9037cfd01a384cf92beab/52034096522.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b558e50f9---71150598408.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/6598401095.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a3c5967f164bb9f6fdcea0e4d1b679aa/xaviwoloza.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/vapuluzibubifaz.pdfIn PDF document text
    • http://packturf.fr/files/96485222824.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/19798088819.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074afa463613---96424540835.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10288 bytes
SHA-256: 72cd36432df3b1a698423589d36455932bd05dc835fa35009f391b1b79dd85a1
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 18544 bytes
SHA-256: 64283c3aeb493e62bb3ed8b4931283c6277484bf220990f941f60e549d7cb1b7
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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