Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9c06674a1ac2c1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 16:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83064481d1154d44d08a3ff9817938ac SHA-1: b285bfe61347b1facf3388aa005b66f8ffc3c1b7 SHA-256: 4f9c06674a1ac2c1315e092f6331b039480904da80ae0b1d546e50bd632152ef
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, exhibiting characteristics of a phishing and potential malware distribution campaign. The presence of embedded JavaScript and external URIs pointing to compromised websites suggests an attempt to lure the user into downloading a malicious payload disguised as a browser extension or update. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=campbell+biology+download PDF link annotation
    • http://stigstudiotecnico.it/userfiles/files/76118472026.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bl4fgohn656obuqanvh9q13p6g/91508349928.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/najawojeluzimipo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147f5a684ae3---veguzunamejezesaba.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/13332881485.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/jaralilatuvubulunobunas.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/nurubabibedoset.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db85b0159---xisajenijuxex.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff3f94fb46---454925145.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/85056581828.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/30352803586.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/83086476951.pdfIn PDF document text
    • http://qdcmd.com/data/files/boxeviwalexetanalolal.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rorelutatus.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/pifetazukoruxine.pdfIn macro / runtime command snippet
    • http://www.ecvbrass.ch/user/web/file/rozagozobibodugidag.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/53876081808.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/45564459369.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5f6c9c132839a2853fa90e6d227a64f/60151820926.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/25f7937b54b277f2dad105890d7bae41/88689111211.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/vuwami.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mipukenikifodumonamapor.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/jisamoxotut.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/r8jodi1le1gccmfmabus20n3hn/21101396194.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/85854222936.pdfIn PDF document text
    • http://autosoftIn macro / runtime command snippet
    • 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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 17872 bytes
SHA-256: 21f1996c596bd88950de7912e2bf0d7a4382cd92b4b0f4e73c95e63ec4427034
font_01_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 10740 bytes
SHA-256: 407261bc8645441a4ffd315502daa313fdb916b6b5527f2508328800cd52b470

Open this report in the interactive analyzer, or submit your own file for analysis.