Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cb1d642297989f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 17:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a3490b41649215c89f56f10fa097bb2 SHA-1: 5419980c8ef68501b350d12305ad2160c5ce9b60 SHA-256: d4cb1d642297989f622403da93793217785eb444cde959146b0d877196900f54
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059 Command and Scripting Interpreter

This PDF document contains embedded JavaScript and multiple external URLs, indicating a malicious intent to redirect the user to potentially harmful content. The 'Clipboard command execution lure' heuristic strongly suggests the document instructs the user to copy and paste commands into a shell, a common technique for executing downloaded payloads. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=android+phone+to+laptop+screen+mirroring PDF link annotation
    • https://nasco-ye.com/uploads/file/22412572401.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/lapelewibipakiwurixoku.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b5ba7a4d---59661247281.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/98851427420.pdfIn PDF document text
    • http://specimport.by/files/files/31553872170.pdfIn PDF document text
    • https://brs.jo/userfiles/files/pisodosaretogigipuw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e2c39617d5030ef4c19522437c9ee8a0/38167547087.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/5745521759.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/5162653313.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/vifiwirologu.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/pibezajuwumalop.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pibutigeginigodututowizoz.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/18778204300.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/sasudugususipesuzifajis.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/2377869280.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f681a9782c---55004411550.pdfIn PDF document text
    • http://keacg.com/upload/files/zabojojomagutatonifog.pdfIn PDF document text
    • https://koratspring.com/upload/file/83373248924.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/14830805965.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/56297400346.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/4339734510.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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 10944 bytes
SHA-256: 7ed7ec156ccae930c171fa9ee18075c936eda6e233fccf4d4bc0ea4ab6d699de
font_02_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 17740 bytes
SHA-256: f097282879a0ddce8952e18ddafa048412aa92cb7abc13c55640585e2571136e

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