Malicious PDF — malware analysis report

Static analysis result for SHA-256 004e456d2d55aa82…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 08:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92fc15be7a13ea3138a5c92b1216221a SHA-1: 25f7ff2171bd914217d5f669480804c84de3e7e0 SHA-256: 004e456d2d55aa820d36b93dbe40d7c9b6625c08772659d46a8a84260669c0e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://davidlbrooks.com/clients/868292/File/98241550643.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098327b0b74a---84540831591.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/jorowabavar.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ralomuluvubizuguji.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/ditef.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/vibagopojonoditawesu.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/fatevalavimilizoxizuno.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zogewinewifon.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/masekajafenawefi.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/nazuzugotiza.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xokusabotobosefix.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkd29gt8msh205s0kht8bicgh5/bejiboboraw.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/garazesef.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/zinukivogojojixuzat.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/51572086607.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/14731338785.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a9d793d8---galifupelefexoxumidowo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/90543007549.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/27775224647.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b64d2b1f2---bexoreroko.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/lurefinovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=draw+the+labelled+diagram+of+human+alimentary+canalPDF 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_off0000bbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD0 16204 bytes
SHA-256: 058d62e4b8360ecd19d3cd10611dae8eb91a74f187e201b50ef9dd6c3d577f7b
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 11196 bytes
SHA-256: 60e7983fa4548f014e768ac35789e74b0e1780f85fa6c9b131bf64649a4d786a