Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e82331422a3e02…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 00:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f47d42c492f477ea19f57370f6c01b72 SHA-1: 6aeaa7420028b5e9d937e1f1349a157d3f2585cc SHA-256: 23e82331422a3e0251de2bbde7fe74f452e8fe36a8b1999c6d08271e8cee4b31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for distributing phishing lures or malware. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the sample as malicious. No scripts were extracted, and the document body was unreadable binary data.

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7aa5c8a518---vabiwezuxavukukiza.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/12144ab8651e32bb3f1c3003017a021a/53967468943.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e0fa3668abc7f8fa6d83f55a99524b1f/47817170758.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/vikujan.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/60357973444.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/8427127546.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gawakomawajedurorugid.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e58f534c53e7131ee189b080de53ef51/79627975184.pdfIn PDF document text
    • http://camwater.org/media/files/jokixawumajenunusa.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6936580151.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9856549af0---90846264375.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/66413100069.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/58560222567.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0942f672---1838251165.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ad3f0eae---38304018878.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/13619006066104992352e93.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5333f576b4f3d9f68f66ec841e98d58e/88809531821.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/2035777628.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8a1cbe3678b566884b2de6ee395bbb6/divolejawonebusegupowoj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7186cf9c691298a2020194df76ba07e2/60402296537.pdfIn PDF document text
    • http://brlairport.com/images/file/togavuriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tgc+131+notification+2019+pdfPDF 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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 18876 bytes
SHA-256: c1faa29bf1e6f95875c42bcc23af796a0388bf86498d38f78ec62178f2582efb
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 10948 bytes
SHA-256: 605ae5f5c544ac36f4951fc127974c14010cd21bc9c06fe11ca5a056d7426e19

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