Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8799735d0189802…

MALICIOUS

PDF

95.3 KB Created: 2021-07-01 20:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fdf6252736ebd0288a172e177c2d515e SHA-1: 9d43a9f569860e1a4c7ec491e6aeabd7ecf4553b SHA-256: f8799735d0189802164186641100130998befdc41a8ad8ffd11be90ab2aeb938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan distribution vehicle. It functions as a link farm, directing users to numerous compromised websites that host further malicious PDFs. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into downloading additional malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5935657d66cd6d8542ce4f6ed7bb333f/20749672151.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfac9408a---taxobepo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4fa70049870ae9b555869dfc94fdcb84/koxajofem.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f53bcde374fc87acaea3045f0a39670d/jakezolekobarudemuj.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ef73d20blbf88ud3799av1g2n/mefesamanebifikeze.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d60d1bb22027f40e31ade85acc89fac8/vekisezi.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/vunanusizapi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p6gp69p2nkjoc8t5ut3emqrdu3/30795402811.pdfIn PDF document text
    • http://bakoca.hu/files/file/pojulubujodiwapobe.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca767113bc3---janefawasexa.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/getiloxiboboja.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/fanaf.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f7d60887---womorekuloj.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/xigufogav.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d389ff18---46220947332.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/rijagenugulowivetimex.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5a932ed---65082385790.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9e5c85dc---pulezadanenikozev.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/47212743880.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92e4034c9---kusagetuduxopu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ddbabc1a6---99227872238.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b65c431f---zagoganunaze.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160975ac989280---52829488089.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5cac8fc7---92918861677.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ada52b262---73780284659.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/67009027818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=be+more+chill+jeremy+actorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 10520 bytes
SHA-256: 687afce5d2b4c2553e8bfa69e861eec73a03fb1b3c95e7495a1862185979fead
font_02_sfnt_off00013f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 18308 bytes
SHA-256: 33898041e7d6a04bbdde28662d87efb977f42bb527c338cdc9e524a265828c7f

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