Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33f013cf44d1feb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 07:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00166582b5fd85abfd6f32dada4ac6b2 SHA-1: 633697b0d0d5220c26482c144d9fd50f28d44217 SHA-256: e33f013cf44d1febdf916a598b79b03d29c6cd0f25b59ac3b4772cc11f3936d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and link farm nature suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://terhautz.com/upload_files/files/kakapinelifokedu.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7df7cbefad0aaf2be344fce3f216514a/rawezexuge.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/58265687465.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883710dee77---58113741777.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/80458040244.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ab57bb76---88621949139.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/27844290532.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9566240fc---kafanuxu.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/navujifapisud.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/3796789918.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/28471643158.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609623075f5a6---fazatefoguwipovif.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/janofevuzuxozatipu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9d8976ed---mutev.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/601cfaec2b3870a686fddd8ea2f54c5f/75725222716.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/20889320839.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/86022825508.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/5409032026.pdfIn PDF document text
    • http://laserinnsbruck.com/static/woxim.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/39307121855.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503a9c5e67---36394599462.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4c28ad2f3d7b44bd36ca531e943091f0/99987001310.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796cd80fd2a---60788616278.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0d45695a---73920904037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dictionnaire+infernal+english+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/fenukolowuruvumekek.pdfIn PDF document text
    • 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10900 bytes
SHA-256: ff8eaabc8ec71ad2a14c65d17c25be76b6cdcf3d36fe2ea4372574e011d7ecfa
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 18380 bytes
SHA-256: 41dc456893833b5621a8fb0abcbd764199499976e1ad7b42de7de19b9a77e476
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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