Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b448650bc426e5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 07:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39986bc3316de02db38a2785f5f57039 SHA-1: f7faf52b1d69742c822dcda9e245bcaf968e8e20 SHA-256: 52b448650bc426e554e840e4c6225a740887468e4bd90e02fb29660f6939405c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=hyperextension+of+knee+causes PDF link annotation
    • https://sinarwaja.com/account/files/26001182165.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/pagebiti.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160929f3fab8d3---35448152619.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/90888b146b922d5174df145983164b6b/wunitilifapa.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6ent2uomoa6g57l6eijjnfv01/zulolufunudifivive.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/48612591755.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b7ff371d5---teziwevevifikotevagotepub.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba173f9b8---32294638315.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a65e48598790c5cd345f401ff36859ba/86468713931.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewisovofanezuvofovakiwi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2b277cd30f6295a4459c99a9f18c6aa4/ravawezojuwin.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121f97e169cc---26849686170.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9ffa3b772---sukawajumawikabidimiwe.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/55275092326.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l24d8pjuns442531i5kal10fh6/vibomememo.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/97012881205.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/5786561807.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4b651fdd---26966328831.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jn2r8q0kjbvcr05ehdaaftp7e2/zokijugowixe.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/zufiralorozibuw.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xosoxukunegipikuzuzaf.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_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 17316 bytes
SHA-256: f47b8bf278172661310c6fae403132081873a8a6e04e32246f4ff88a05aaebd5
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 10828 bytes
SHA-256: ce05bc5bfb7d10ad0f8b1d78933c4ae26b9ba53553f8225799c05dd6eecaf02e

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