Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed396e994698d488…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 06:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66cf9517d9fcc56ed952f695d625d14f SHA-1: c7974f8fcebf3140098f2dbcb77ffe05d6cc1304 SHA-256: ed396e994698d488c83c21dd719e2d4a2c67c92c28b79b71983579aae2d1c939
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple compromised WordPress sites and other disposable domains, likely to host further payloads or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5123

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://pistant.ru/uplcv?utm_term=chrome+shortcut+switch+windows PDF link annotation
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f3663883ba2aa9f5960452a51a328464/ralutifajatajipa.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/gefubegasipavapas.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/robutuvix.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3f390b74c79a6aa4661aa62f6c081cc6/zakezidilesesedexo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133b26fcbbe0---gepelil.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/51398517031.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/zatawabavurubule.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/94349279393.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8336647685.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/32898102649.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0df708caa56613d88e1ba39a76308b86/kunoxiputaxinizivowoje.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/43034908493.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vmbuuqg9mtpduhvmopalscccck/69404251908.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/tipopikonobonedumazij.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/99814738920.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8b20c842---sesilositowoko.pdfIn PDF document text
    • http://agilesolutions.in/uploads/75179134310.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/53648937143.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/46607866191.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/63368451747.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kidesegaguxig.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/31923798708.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/marowufazugosumizuzisof.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/94748535d286d4f20d0407982ba19e58/somuji.pdfIn 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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 19968 bytes
SHA-256: 6c2452da89faf10712409a70c0512f172590facd7e1d1ac9adbea0a0e9b63a25
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 10644 bytes
SHA-256: 14c3d1e00dcf5bed91e7ca2fa2e745706b2b631c8eddb8a56ceb7a80fd7412be