Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7239c4326b9001…

MALICIOUS

PDF

82.0 KB Created: 2021-06-29 20:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cab25ca99572d97a30d4a928e8be6e2 SHA-1: 7702a172e4b36d5491566d9ad171e71e2fa75588 SHA-256: fe7239c4326b9001a1a789594bf61e67b533fa0ad17a1d377ef6b8dc29bde8b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern is likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://adasms.fr/userfiles/file/lobejajutapejasomoz.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fe8d2f9d---pexuborulukemuja.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5242f8927b---65943791460.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c2b049d90f72714b4c591d82dd032268/51542780784.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6461813---jojamulonewitegalil.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3t3adpn0jc9ah2gj3vvdc4unn5/rufesabedozewegaw.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8c4a795a---95736419362.pdf
    • http://piazzademarini3ge.com/userfiles/files/ruwifunilu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qsocenesehoo96hht8sqiob340/53732846919.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822997869f---5360668283.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/80923692280.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9579278ad8---voxubowapunulaka.pdf
    • http://glotecgh.com/upload/editor/file/dosevebutidi.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f02a003c---jepilefizojafefexef.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93dae7954---zinalafopupesobes.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e634d30f---56687652336.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d9a387e311673d60f0145775f3062612/82037703103.pdf
    • https://metricgroup.it/uploads/file/vafenagimiguvunadig.pdf
    • https://synersys.fr/contenu/file/gisizagopelugikufudi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/wedupojobulixupemoxosep.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdf8bb628---gofujobegijojavid.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f78a54c85d59fe333d8613634f184116/zibogu.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hqvf7rh90odk3hf25ffjdoplf3/74048200894.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b495b77c9---28464329284.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dd9142211d2f232d4d7ccbf5277c3668/93854480251.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=refractive+index+of+violet+and+red
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 16792 bytes
font_01_sfnt_off0000f294.bin
c188a2954a4392ac77d595737b419f4177a15e23c3b4fee3ce471a9b51141444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 17988 bytes
font_02_sfnt_off000122b4.bin
e619d83065995d3dc73335492d94fc40cfe340111307cfd86e96ff567b064a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10516 bytes

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