Malicious PDF — malware analysis report

Static analysis result for SHA-256 f694c6359ac043e7…

MALICIOUS

PDF

98.6 KB Created: 2021-08-13 06:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 737d3fc68e3cb153473f4bad12363732 SHA-1: 158832bc6dc05e562cab073896080800a4e2ba62 SHA-256: f694c6359ac043e7f0c9f23e00d9448ba76c265bb3160a1b0e109bd954ff4c4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads. The numerous embedded URLs, many hosted on compromised WordPress sites, suggest a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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.
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe260fee9---fozutuvikab.pdf In PDF document text
    • http://techbis.pl/files/file/tujamelad.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/52a8c69a8706f5a9966d3e3d3924247d/niwobuxeme.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609801c88742b---68972359215.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/34453655735.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lirakuxelunironud.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/kasimolopenaputules.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/lutofig.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be06880e7a---24727354296.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ptk2eibkbvtetlnip2h02v1iom/riwulise.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/sevuvewarowanejufaga.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/831f79b12fdd42966c99295203b6fb84/27140286154.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad1c63a9ce---65252894950.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/73012694176.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/21149143744.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/linexetuzexusup.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/87910103065.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pa4bjbu4vjjuek2cs3jfgmdaa3/27187974544.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/panixem.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b91dc1574---timodopuvufukanetumu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16113f276c3743---92582306063.pdfIn PDF document text
    • http://brenderup.ro/mm/file/46486829531.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/76201331640.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bmcktn2m7ea160ookpp7lrekr8/7900934438.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/91450273291.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/56645822280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jre+1.8+0+191+windows+10+64+bitPDF 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_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 18684 bytes
SHA-256: 48f425fe2b19ac2782e2c474c90cdccef10e8974b72be36b81f06009804377f9
font_01_sfnt_off00014960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16177 11112 bytes
SHA-256: aa17a29b786bce53b802217e7809d7875b242ab0ceaa5744737e2803f5fb8759

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