Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ca371a7813fc81…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 07:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4f484eea9f57cff058d3449c931985ac SHA-1: d14fcf8ffb9ac814dd2f239a1140809726e2bee3 SHA-256: c1ca371a7813fc816194a0c896bdd760334c26eadd8c8091ac850a06dd5b0701
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://girl0229960192.com/upload/users/files/lejogepanotugeguvu.pdf In PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/55299767364.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6fd9ef18771261e92ef373ccab4ae9bb/fogajubibajew.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/45647205798.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b14f47382---felevugakojajajize.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/17942000282.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bogigenevadabirodox.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e7a1c8f0---kateteninum.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xabawufoganabibunoxisir.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/24250707513.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jsn3sd7oei9jriiio4od9eggd1/goragovibuwevenogavigaja.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gupusal.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/90942031857.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2jsno52gtbqtfiptujtju0vrd3/80511854226.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cf760b1a---33952281212.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ff4f221a9303ea09fd3b6fb01b023e00/15049020297.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawurezufafijogixizuva.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6ac2a137---puvaturujiwawosufatamekon.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/daguditadibowuxu.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/84055730503.pdfIn PDF document text
    • https://irrisyst.eu/files/file/42698256901.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tanetesuberuvorolelib.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780f4e6a2bb---pidetunalukunebisape.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/49187884173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=history+quiz+questions+and+answersPDF 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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 10692 bytes
SHA-256: 93d3bfe0cb873b5aae70d45a7f190d2d2a8c879922b8e420aca787ff22e81e1b
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 17872 bytes
SHA-256: 5ded1a0d3a2bb07e538fa1eec3be4d2f4f18f0872bda99d40af584bd4f4df2d3
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1