Malicious PDF — malware analysis report

Static analysis result for SHA-256 6913eaa92041e6f7…

MALICIOUS

PDF

95.3 KB Created: 2021-07-06 17:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75915961d8d81e06262522254e445748 SHA-1: 7ebe59460d86a1321f385dba6236eba31f482cfe SHA-256: 6913eaa92041e6f7c7c8e8f0d82c824d779f10f75d125908ee81af42fd042700
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, a common technique used to redirect users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://philabc.ru/uplcv?utm_term=forceps+used+for PDF link annotation
    • https://bamor.org/userfiles/file/50376973552.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757b5522c84---luzuvobegofobefusi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c2328dac---64724317654.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6ns41ic8oa0v7dcgnvoihd6si3/18464732102.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a147703fadc2bc5ec21936e984e385e8/28458660830.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef924403cf---7672798963.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16223482627573.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/povivoraxejipisa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ebe1dcb603dbeaf07332b78a1805754d/59432759124.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/wufekabuwi.pdfIn PDF document text
    • http://mousike.it/img_ins/files/jarigokajuzajari.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/59667758760.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e03b0e1dd7f---35317777759.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/97276665404.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/69132306840.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160943e58136f1---66406510252.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/gelowaxiva.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aed1046d9ca---nunudojotevapu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dlpdb89opg8ejjgaebj9phi4d0/kubiza.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ks4nlg19umlh06gdlk495qff4v/40025497197.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3833c3057---56482233171.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/usi56ngn5n418nek15c18vqh34/3292582213.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_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 17776 bytes
SHA-256: 996787bd4e2c1dccbdbf30b014ccc608da65a2cfb1f163db0864b5c698c848e7
font_02_sfnt_off00015935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15935 10188 bytes
SHA-256: 1fbd924fd5b5e5dfa98f750447d9e15aa0cffdb50cdce2b2b19fd7b27519dffe

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