Malicious PDF — malware analysis report

Static analysis result for SHA-256 b924504b7e1b14b9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 23:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 994e4b95d50a13f76cf032e0de8c8374 SHA-1: f9e918b166acb89946a16bf34254097a2ee9fa40 SHA-256: b924504b7e1b14b989c343cdb09810fda5f91931cb26a8fa9f0ff1653b68d738
212 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to compromised websites, suggesting it's designed to trick users into downloading further malicious content. The presence of a visual download button lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://coretry.ru/uplcv?utm_term=manually+install+drivers+driver+easy
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab21d96fdd---78838691590.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ea0663ed325fdc132ebfe21f7130fe0a/zilozamo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b09be2c92953a171dbcabd1ce290a7bc/81173964495.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/7342706686.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493d8db21b---13842171810.pdf
    • http://ilovechardonnayhills.com/userimages/lenotisesorebezafa.pdf
    • http://gamjagolla.com/uploads/files/48489979404.pdf
    • http://charmingcurls.se/upload/file/mumubatarixegolunofesek.pdf
    • https://namlongadc.com/uploads/news/files/wofatopojasudotawotogujuj.pdf
    • https://argumentua.com/i/file/pezivemodunanikejupi.pdf
    • http://technestudio.eu/userfiles/files/lefanilifisiguzerinewi.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/50632979307.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/52483b093ca13bca1ebb042c7589a25c/panoxuj.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/zobesamawi.pdf
    • https://suacuacuontoanphat.com/upload/files/35960372675.pdf
    • http://www.irrv.org/uploads/files/jomisawomewi.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c21a3dce8f6---xojowivezuzu.pdf
    • http://wccflooring.com/userfiles/files/folumilogurefupagil.pdf
    • http://flatadministration.com/uploades/fckeditorfile/69591897302.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840af526035---54472950570.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741fdb211fc---29202852780.pdf
    • https://mimpishio2.com/contents/files/jukavu.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/torozozexegibolorex.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/nivuzuwubafipadupulu.pdf
    • https://viboot.com/ckfinder/userfiles/files/malis.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/42037164617.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbec.bin
b7ca5e4e926c4cf5815634155d22747e57cf9c64ee7643ee25dda7298e398049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 10392 bytes
font_01_sfnt_off0000f399.bin
ee0c964107a5af022f8efd4638ce8d3f00f40be07e7ea0f7b5e675c9c6ca8324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 17360 bytes
font_02_sfnt_off00011ff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes

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