Malicious PDF — malware analysis report

Static analysis result for SHA-256 8142b292b9a7028f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 10:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 913c4ed15c7da09e6a908cdcdb6f41fb SHA-1: 8955899849c42e06209dcc6e89cb2b14f28dd8a5 SHA-256: 8142b292b9a7028f694071625ab8f73e93c0bfb013b1cb48ac695f33eb8775fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lead users to malicious content. The presence of multiple external URIs and link farms indicates a probable phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=pickens+county+detention+center PDF link annotation
    • http://cdio.vn/uploads/userfiles/file/81115852947.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/nilopagof.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5e1f2551760ba54c337e0f2671babcc/39383020069.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3cd29881---kemofofudu.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/mejofubuguradutim.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/90684468297.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d4d8532d8261a4de2ed7e596b6f7d43e/9503495735.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/6ce325f4b3dbe896e22716d74db55721/kofufexunimuli.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/9343593428.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c505f2464c---papidolexeporebek.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/c5588513db5113cbcb33f3d7ebc15ffc.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/85fee1995a5be61db2892b19a928c55a/bebixadokirozakelinogetew.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/95141264720.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/5148219380.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/tirawixodup.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/86350706923.pdfIn PDF document text
    • http://starsunited.at/upload/files/44666427193.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawomakebuwo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/39292461429.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/53879120073.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bec56af1e15---5415864682.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/nenutubuve.pdfIn PDF document text
    • http://peak-experience-japan.com/54693201747.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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10460 bytes
SHA-256: 40db6fd6012421be151a0269d615e2bfaba7e51e4a94b018325f1fc394477633
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 18112 bytes
SHA-256: cc95910ed195fafacfc8b41f3843db6890194e468ca1fd76b9ac9aa6fe74dc9c

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