Malicious PDF — malware analysis report

Static analysis result for SHA-256 051196a4d3196116…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 00:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05be2f519b727d6becafb8d1b6a03388 SHA-1: 2fe8d6ffde7b8bcda796de225f78972461a2f20a SHA-256: 051196a4d3196116043e2e48352bde0839035080baaf8a10f70ecc54baf90001
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The embedded JavaScript likely serves to facilitate the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://wohingltd.com/userfiles/dukexo.pdf In PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/20883176573.pdfIn PDF document text
    • http://hybsch.it/upload/file/69084657527.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tebakonapowon.pdfIn PDF document text
    • https://dcimx.com/files/52630421385.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/20549819661.pdfIn PDF document text
    • http://abnicum.ru/files/file/3379189156.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/solalododewuk.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/20232867994.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/vitedulekosoguxemip.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/40577313151.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/sifelawaxofenibami.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9c6d9adc06e14c598aefdf510ad977b5/63922153344.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/31517441376.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1418263ee---75088009001.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vutufitiviwakizizufevew.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/3362710651.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/57878395237.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/67689189919.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/18165365842.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/41784927823.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b8b72aa---kolozefojufu.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/pekulizowot.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xotetoxafosumukinam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=recuperar+datos+de+aplicaciones+androidPDF 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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 10652 bytes
SHA-256: 7bb16194e97129efc0bc496834871aaa336cbab588123d1f4945b2e346d6a7a3
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 18488 bytes
SHA-256: 5b18feea4782f01f008a52ab419c6a29976bf05807a12c0829a7cf5c8e679f1c

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