Malicious PDF — malware analysis report

Static analysis result for SHA-256 e509d9616ad4f9b7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 02:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7205fb4b985fea10f48487890b34c8d6 SHA-1: 4a1ecdbeb7c22634dbb2aa37434fa26cff29ce42 SHA-256: e509d9616ad4f9b74f148314c5a75084ed5d13e362ba57f99781cb4a81d8eab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nissanotogovap.vn/uploads/images/files/81469482111.pdf In PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/79911026372.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/5901877897.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e23e365e4---wejexasolisozi.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/jatamarewesoboravaxutab.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/4c6a0cdf2bd3f010157bffc2bb2344a6/ginunagetoxen.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02e7b31d8---79852733904.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/af1cad4d8d2bd09053d5db47e01fd6ef/20995598584.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c74bc8795bf---zikakuno.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8cd0f88e3f97def68a469630502e06a3/muwetutavexobunaderitari.pdfIn PDF document text
    • http://hanleyresources.com/images/84834095542.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/balowiwowemuwafobi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a8a4dfeb---5463100206.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/91356282136.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/22474138489.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef83188021---34177140680.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bee77c35e3e---22370963077.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/17594d9f48af95c070e4f320ab9e0330/sokaribaduvujosos.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/95325753081.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lavufedilarigopuwe.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/kagijodopatuniwamudepes.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/razewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=calcestruzzo+precompresso+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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 18196 bytes
SHA-256: 692892adad472559a4adf4ec108affcb3c94870c014d7c866ca49c7e08e741a1
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 10776 bytes
SHA-256: f9736e2914128242e1be154ec8cdb3a2b1a854da2991b6dddac09e9350f38922
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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