Malicious PDF — malware analysis report

Static analysis result for SHA-256 937299496b019987…

MALICIOUS

PDF

98.1 KB Created: 2021-07-29 23:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21db92dfe8bfc8d12823188500e67b2c SHA-1: 629b440e4ecd645719031eecab168e198abe9c6b SHA-256: 937299496b019987cef625a3bb36e86ec2337dde7f5ee2f8794bb7ffe07234e7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains heuristics indicating it instructs the user to disable security software and includes links to potentially compromised WordPress sites hosting further PDF files. The presence of 'cmd.exe /c "where.exe Sysmon.exe 2> nul | findstr Sysmon 2> ' suggests an attempt to check for security tools, likely to facilitate further malicious activity. The document's purpose appears to be a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ced95260bbfdb584ed4d564d4b343dcb/12551484665.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f34923031---zoxubagibusizi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/badartoda90tn2che9gt4i5c03/lenakuwizabebidajiwekuwe.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/lakurexizajuve.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lolizuwefarudufuwo.pdfIn PDF document text
    • http://brlairport.com/images/file/66691050164.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2b692382d8a70b2d904356591dee63ba/jexonupajegizisokin.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vitogisagiw.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/wevudoxurepavigalesesadu.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/wuzobawatofabagev.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b209bd32a8---virokalerugutate.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/werum.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/76686309988.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/wosuwarezegilake.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/6074826733.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/35110279384.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca6a9d940---pizora.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56787ba9dd---duxusoduzesuridonen.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/vikosokewotowozumo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/ragutexe.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/mewenikonomemuvokusi.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/42625939842.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/pajurixawigafol.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///5559747014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=uninstall+crowdstrike+falcon+sensor+command+linePDF 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_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10824 bytes
SHA-256: 48e655a818f5a1fd82abc18ff83bd6606828e0d8b7e1c72de0100afd3e015312
font_01_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 18728 bytes
SHA-256: 22a456c2a9c616649c9a51e107c91a58d7485546ae1b647c6b22693b7a2010dd

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