Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b09a5b5ea70dd82…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 22:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c01c5977db50f2b460b2f5c239257c6b SHA-1: 27991cb4c27dc6a97eb56f562d0e52060a72d888 SHA-256: 9b09a5b5ea70dd82b29694fdbf41291427d9d34e387e05a93e135717f251c02f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90ad188a9d---sizilona.pdf In PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b251557cd65bbffb14bd49d02479e98f/bojezezorisajujapuwefar.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac8725fc6---kabitogubi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7e49384c---jotovadupapuzis.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/64783444694.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ebe7eb13d---60736507986.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/969106b083fb9fb56865f998c814e821/romojefigedimoniji.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b25106b545---korezepapavifiwopiri.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/mejexivafevukeriwanuviger.pdfIn PDF document text
    • https://empresa-venta.hr/files/85054075293.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sqoe6tjuvhmm94biajpv2vl6dc/wafefetonegalivamomilo.pdfIn PDF document text
    • http://abc-tel.ru/data/File/sivapowele.pdfIn PDF document text
    • https://bczenekar.hu/files/file/nigebuvagu.pdfIn PDF document text
    • http://chieucoingason.vn/files/81871932129.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a3225ff7bb51193f9648945aa15e4f12/68762698468.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfafabd49---65169357032.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d59ee5975429704040e1228438c9ad2/pewewidajerikanekuwivoro.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/44264222300.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/tilinigigedugera.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3b63f69e---17867678218.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/14589332161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=100+meter+sprint+training+program+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_off0000bb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 10872 bytes
SHA-256: 03c8142f7549839dc7a25b79b2d053c34f821c6f1ac2fcfe50c45275c141811d
font_01_sfnt_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 17164 bytes
SHA-256: 0acfd974927308145f1e84e10873bbb78db6cef21118013d95663574951873d6
font_02_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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