Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ef06b3c918067d…

MALICIOUS

PDF

84.2 KB Created: 2021-08-11 20:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f0c2c672d4970fa8ed878152d060b34 SHA-1: 189eb95d3095c2d72473a6330bbc5a002a7c9c47 SHA-256: c2ef06b3c918067deae4f67d78ac06a84b5a19559b36e7b3a545ce9746e818a0
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely serving as a lure to trick users into downloading malicious content or providing credentials. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's intent is to prompt the user for a browser extension or update installation, a common social-engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/b4cdl56lqps4p1kb1i07374flv/71195155200.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608199c5e5fb9---zuvotuna.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210611015428_kdwl32.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/noditurowin.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tejisazutetu.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/sobebut.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/degevimisomipufenelubi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5aeb52df---velurujajonomiw.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/luvatuxapugozomubirijeme.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cd5e104fa---janusurotebaloku.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/lokuwud.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/98215533799.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/92616933269.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/7089497033.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/60019643084.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/efvlq2biciidh1lskp79qeamo6/79882399961.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9669dc8627---25758316009.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c303945971b---dolenanusote.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/48893392624.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da85afe2bef---59973719098.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5e3858e447226505b5c598981c384c1f/soret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+super+smash+flash+2PDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/33191299480.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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 16812 bytes
SHA-256: 0ab59e7a322f0a4d199d2069f225ee8cf3f67a90a51f42a96b6a2e04ddc13e62
font_01_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 10908 bytes
SHA-256: 338cd535b2722ba6a8282b8f3ceac9550e07a4412a0bc51b7d578bab57786989

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