Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd999d135fe7594e…

MALICIOUS

PDF

94.5 KB Created: 2021-08-19 01:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fcf84e07ae975ed5c89fe0299f02727c SHA-1: 798f5be0506296b65a2e778b7b442ad33af35a4c SHA-256: bd999d135fe7594edded5005933d8591d18fcfdab3e4af894972bbec4fb023c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://proartgaleria.hu/files/files/givuropij.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160daac8531cf7---87806424210.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ed6e413ad76b6466b050ed600d261f61/lisibezuzebamajijinu.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baac20420---6703849294.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610945f3e051f---94230428688.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc525dd84f---noridebowaviwepoforeb.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/30641594076.pdfIn PDF document text
    • http://fxmeat.com/upload/file/9e51f84d419b293158684b7c5d194545.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e938d99cf---mokawagox.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/dogaziw.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/11466347350.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/23946802829.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88278556460.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a26fa8a---xutidujeb.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/venamegusazav.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/zizuwegetexuxapisidereru.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/90355034536.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/3137324087.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/tekidatubererovobipomo.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/28173883287.pdfIn PDF document text
    • http://khocabien.com/uploads/files/16463359879.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/50kojk6c0mniu1paa515dra0gn/melasivusoxovupur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=planes+de+entrenamiento+baloncestoPDF 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_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10672 bytes
SHA-256: 6410dfa4884d3119638fe70cf856caea0f1e7d4f5ee3d50aafbfa75632c777c2
font_01_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 19196 bytes
SHA-256: 3297b2f45462982126005fffb1d47e0dce573a09229e5964a814a258a2694a1c
font_02_sfnt_off0001517c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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