Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c8d325c4aba749…

MALICIOUS

PDF

91.3 KB Created: 2021-09-05 13:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a323586eb9e3db9a961d955a40c6564b SHA-1: 9c2dc2a0da9b78161caaa05434503cbda964bee6 SHA-256: 05c8d325c4aba7496b3b586b2047332f9acb96e6c8961eb377a848952be9db49
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's intent is to trick the user into calling a phone number for fraudulent purposes, aligning with callback phishing or tech-support scam tactics. No scripts were extracted, but the overall structure and URL patterns point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=ccure+9000+2.7+manual PDF link annotation
    • https://cargotavio.ru/files/file/giwuzonimutijuzotev.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/61c0eb403bb6374415f283f9d9a15aef/wisiwujuloxigitube.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/555ab8f85243b094dc4ce5a3d32bbf2e/34713993367.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/83908466950.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jawegopexetilox.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/dolalorojajose.pdfIn PDF document text
    • http://186086.com/upload/files/kafiziwulawuvab.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/tijumunipuxedipijim.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d766de5554506ce3daadeffc260224c/gukiserazutajazeginowu.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/gupasomeladasexalezuk.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6bec26e0---85948188974.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/romod.pdfIn PDF document text
    • https://sinarwaja.com/account/files/28502981777.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1d8f787a6358bc9348441a24b9d8fe7c/67082257532.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/molewutilisewesa.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/65379806998.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/76712286165.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe3c00835f---marajes.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/32340699901.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/kudujizo.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/xixanunulu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/nanubutifik.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/logozawobi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96aab37c4---witudedegokuzedenawu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/bivakerekewefaviwakadisil.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_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10572 bytes
SHA-256: 6e0390e9d7d520e4db87f26b9c9a3681d0498770b02571e9bd33027e139b0d3e
font_01_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 18080 bytes
SHA-256: 542248e270bf6158c83eb9b2a5fe1f2a31b86b13c537a16780e49c673ef07a7c
font_02_sfnt_off00014782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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