Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63b2ab694d703cc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 20:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f3fbfc3aacb9d6d41aec004fd4c8e6a SHA-1: 63a73e9280569b532382d22a45a017fcec374b9a SHA-256: c63b2ab694d703cca67ea327c5bf0b3b362197adce6232415aeadaa6590ea205
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://opgzvh.hr/upload/file/gukenexefaroxibojon.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944bb6f6c2---66568617906.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/bivusimewireramesam.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/tazeb.pdfIn PDF document text
    • https://isosklo.cz/uploads/pifugibonewejogi.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/94723607938.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/bagokibapulakes.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/rixogeki.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/vawirep.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/49682165374.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136be147f94f---3404142309.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/ziriwovemusatawozum.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/86462878928.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210910091943.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/85308658216.pdfIn PDF document text
    • http://talleresjpg.es/img/file/97249230123.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/neremewiviz.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d522a3876---85503832872.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/dijiwokopowowadebabevet.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/xexilujo.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906194635_wmr9ya.pdfIn PDF document text
    • http://space-edge.com/upload/files/6146997436.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/93235703118.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/tosok.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/livebomenowofuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+disable+caller+idPDF 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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 16956 bytes
SHA-256: 34877e962b87d805fc06fd4a9156430193013aec6c0663705a29ea8d2b51b000
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10388 bytes
SHA-256: 0503141d86f437bc0a34f5b751ddf406f52d56cc16c4a86b98a1fa1427909e3a
font_02_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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