Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b515cdb3f4a041f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7eef1ccfea9e260f06955e1bc4afb170 SHA-1: bab459fcec6ad0cb350f4b50165d18750b0a6816 SHA-256: 9b515cdb3f4a041f548f63f68d5677e587a32cbdfed020ac6e2b745eae2ce685
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6a2ac4b4---63334739741.pdf In PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/zudavibefagomojobupelexar.pdfIn PDF document text
    • http://ingore.cn/upload/files/vupidafamipiratemo.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/motibigofelijuzujeguxun.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8fqmc5bn8ff50q2bmo3m9otb01/rasufesonojokomunaxaj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c43b079a---43210662189.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/fuzepubegizetemo.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/falenabiguworezeluw.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/68581346952.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/17010427155.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavevamumumunikevugo.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/13145920005.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0dbcr4q0q4v59740k33fs1c7lt/poluxadamalu.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/jelikizevemuse.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/80121013389.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96brksonjmk85nfgqosep9kjg1/14549987696.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/40455189494.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/pofewunobujiwididofukexu.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/39188945791.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/sijevos.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440fb5298b---ruvekosaxirumizudupedazi.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/vovatiw.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/66874355861.pdfIn PDF document text
    • http://identik.hu/editor_up/56513318991.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jezokekugabukisudefiro.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/60276473487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=3d+live+wallpaper+apkPDF 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_off0000b278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 16408 bytes
SHA-256: fb811cfb2c9f53794d8e505d71a000dd38ce1751f8da28ea5c3e6a9fb4c759c8
font_01_sfnt_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10212 bytes
SHA-256: e0dd572b0bff71437f065f2020199238e7a86aad44aac90576c8ba27eb49c99e