Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf3d77bc5d6656…

MALICIOUS

PDF

72.8 KB Created: 2021-06-28 00:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8fedf6606b7675bf434302f5cde82c24 SHA-1: 27f11fc41619ac8516eec8076b1773c8a28440a1 SHA-256: 15cf3d77bc5d6656d030d62c13c875eb3da5119a62dd0c6628b103103c7d3a2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it may exploit vulnerabilities or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e024e0511b---wupirerusejisuxod.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/62309922234.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1363d9cd---26441316059.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gpe8ifve5luc43og7k7otuc5m1/kurukowatazovoxotetaligo.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fivorejuw.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/fasapekesit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6392ae3a7a---92126866024.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3275608bde---jategedobojijapure.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607145d17bf25---sobagegigebudij.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/siviposigimebuxed.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f3b2c89e---sudodederer.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde485b5dd---nakojovasenisake.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e809e5705---mozijogaxiropiwapopem.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/535540cc4441d72012307f7c9ccea1ae/61498351681.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/bc090735c27d6549ef44ed80cfcc0173/84739819579.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb3c570bc---46917665844.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083d55ba0faa---56716492652.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798b6069fd0---25355565893.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/mimevawirubowe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81300c3c9---87464109401.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/54685235269.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/55408954207.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e309cb245---goworumoxeler.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/48853283712.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af982ba7039---nakozegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+fire+game+onlinePDF 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_off0000bbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFE 16200 bytes
SHA-256: 3b8425714e5b6c232b92cc91732064d0112f4b63b4843b119010b06cc037cb1d
font_01_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 10268 bytes
SHA-256: efec211a00fc6307612efda52d731949e792b45a759e66acd9beff6de88cebc9
font_02_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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