Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fdccc46397bd18…

MALICIOUS

PDF

96.0 KB Created: 2021-09-07 22:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7df44b2107e3aa451505264fe46ff493 SHA-1: 226fc0ab56526b39a1b6b8b5c81ad0d0636bef81 SHA-256: f3fdccc46397bd1866d8a2357f1098057405fb1381cda3eba08f2b1e299ef40e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations used for file hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e00d62746---39411616269.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/deleburidawemafidadas.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b58253af7---nuwarufus.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/83463dfab2e518b2944152b232a3f035/saxovep.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c0150562e661cf6748a79857a3f1fd75/duzodubu.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xawivapuxufofukikeg.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/zegazujadazi.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/84696268459.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758bb995d13---55773355080.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/86659905499.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/rosam.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0545ac3e38---41205781454.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/30732421581.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16070334d92b4f---95883202725.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/21effff638d13d47902198c2ba1d32de/pepifipejosifebuxesuk.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bed417c6f8---54858171928.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/38398506473.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/rafupedi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/38430697035.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/diwusufibitiba.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/65321a661ccc398187c3658ed1617396/83207943736.pdfIn PDF document text
    • http://unityproductions.com/upload/files/83016329493.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c83801d0e---48314914068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=temporal+bone+dissection+guide+pdfPDF 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_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 17960 bytes
SHA-256: 5c2db6ec7582c646dae870e1f4d9cfb3951e6a998b605fdc8d48d2e5090c25b5
font_01_sfnt_off000140ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E5 11168 bytes
SHA-256: c58518c0e4b2ef83baf1131ee08eaa89053fde9b079dee9f53f700c8b3b9ff93

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