Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5d49a69d72996b…

MALICIOUS

PDF

149.6 KB Created: 2021-09-07 15:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9d037c0bf1c6e4af77892e1f110ffaf SHA-1: 8c9268b7d9ee346c79964c56dbc0a9053fba943e SHA-256: 9a5d49a69d72996b8388e8cdd5107e5f8962bafd674786bf4cef610f30450ac6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://avatars.ru/userfiles/file/31886519650.pdf In PDF document text
    • https://bamor.org/userfiles/file/nukasam.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/821c613857896671928e25495a4e2a33/medenirefukobajebapes.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7a1f4202ca4a81b79c8703a2a2624812/widufis.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f659d106---72912243893.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/fepepivariga.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/15957339785.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/nuvemotutazexetatovamu.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/ninujopetexoraz.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/gojojofaj.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/kujedakilas.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/fogomozil.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/taxonetujanu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/76652379561.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vesujugekamegesopal.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/fekubajuveb.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/45114652700.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/zozavire.pdfIn PDF document text
    • http://keacg.com/upload/files/30577494873.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/39200619339.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80218670448.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/mitideveku.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nevikadumemuvulotobe.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/gotexeloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=global+politics+juliet+kaarbo+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_off0001e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E13B 11008 bytes
SHA-256: 9c14752f6ce7b8aa4415e79b1bf2d8aea246450d4865df44a56b082c5da0f9dd
font_01_sfnt_off0001fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FABD 20588 bytes
SHA-256: eead8e8bdd235cfa66d785b866e77f6c26086fa56d5094df3cd8afe5799a27c7
font_02_sfnt_off00022fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1