Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4933cec5923948…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 17:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6c78313ecb67fffb4b143e20bbb7e04 SHA-1: d1411549f316bfc901990ba17511b856214ab1c4 SHA-256: 8f4933cec59239488df273279308c75fc7f9a87be916acfe1bf52e46ca9d417b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'Callback phishing phone lure' heuristic indicates the document likely prompts the user to call a phone number, a common tactic for tech support scams or financial fraud. The document also contains numerous links to potentially compromised websites, suggesting it may be part of a larger phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc5253e74---1597923283.pdf In PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodiz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9719251b5---gotixitonivaxejeximizu.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/4063434762.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/74180630913.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613238f57bf71---wajabat.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bf5b2e13---lodokudurov.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/duziputuf.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/kokukunalakafukafusi.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/20470342891.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429d4c0558.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a50fb10fa3e68b5e2633baabd634a2b6/jazuzebepuvuwatevon.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/14819579194.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tamikujewowi.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/webox.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021951828441070.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/86181427450.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/ferafetulokudase.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2070026055.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/37986384491.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/91152543792.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rotugukijuxokenis.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/vowimova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unlock+mi+account+locked+phonePDF 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_off0000b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83C 16468 bytes
SHA-256: d1ef890ca6be99e05b23476b77c2d24bc6e4e565ff52e8c00ec1407bbd59c37d
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 10780 bytes
SHA-256: 125f6b1562ee7a511f957522b2d701a5bfdeaca5dac11daf643c639d3ab1ac74

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