Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f9ea176be4dab9…

MALICIOUS

PDF

95.4 KB Created: 2021-07-13 20:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e23fabfde882170090e69bc8eb9768c1 SHA-1: 690ef77fc5a46aa61b349265248458256cb56173 SHA-256: c0f9ea176be4dab98556b6a3e82e5a6a72f97599a439b4aec055209e7f6e2bc4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

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 https://accu-split.com/userfiles/files/raxomezujej.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/80905630029.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708807ef1ba---28746767190.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85b332fb9---98500388037.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e117046206---sexix.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0baa0f78c9ceb5904cc52d69379e2c6e/20950323702.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609650176ea6a---27246339907.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6cc8bef2---bulalobojuvipi.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/31886579908.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3399b2b4---42678878298.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/90045700167.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742d34e3578---ginujetajoroke.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/lasenu.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/pokupud.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c424d25f09---71482337519.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/569238def6e37c197383a1c62342ab56/4957644395.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/58534358210.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2cccb5752582792f5500c965927a3590/34255989945.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/novadaru.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2c670f86---fibolo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607196efe3923---venejikotuvuv.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/gavafi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c85b054e377403b01fdd190b9cbac666/59242501046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=staring+off+into+spacePDF 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_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 10684 bytes
SHA-256: 74b2a97fb3145b870ee594f7d7521b7a4d6b1d2199cf93aa7e9ea2a3b6bf7e7d
font_01_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 17496 bytes
SHA-256: 244cd18d76584a4f777b2e57dbac734dafe01243fe49e45ff63266e21f0642bb
font_02_sfnt_off0001588f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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