Malicious PDF — malware analysis report

Static analysis result for SHA-256 52afaa388e904b1b…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 21:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17db6c6de153878310f2f1381d3918f0 SHA-1: 8ef878dc3fc075a2f03ee0bd8b8f72b2c6add12e SHA-256: 52afaa388e904b1b4d381468361f760906c678ee419f7d560aabbd26eda8f1f8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs strongly suggest it's used as a lure to initiate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=fast+and+furious+10+2021 PDF link annotation
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608943a548965---56892057492.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/mefomonigodubifakigaj.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd3679b24---99552606138.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf89846fbbe---72342968261.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4825e647053412d6b47b3a8153162559/lozemisijabiwen.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4tc1dlcgf7d2inqdpof3hqend3/251382956.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/jepefutafi.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/84861983767.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/41318916793.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/totatodusigugazugejetu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefe5a2e6c---88562568831.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/ruwurabofazomo.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/39802215498.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f78a1fd5---17895706874.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc496ca6a5f---bagiv.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f90ea485---zakoxawexezojovozaw.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/99724898105.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e54078ba0b37ba7901e9d38798d6d756/joweke.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1b905674---15898156698.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/riwoxevet.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/76796222860.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///worab.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/4438198083.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/suloxemawigoruwegivat.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/8110276289.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 16484 bytes
SHA-256: 404d698f5dd04bed332dcc2b5c2399393feb837f413e94cbb76a1d49a470b88f
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 10540 bytes
SHA-256: 0bc4d27a5e080ac15e5541b9d31e5ed0de690463ea75a9e80b4404d9fd2fa686

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