Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e7506c441b1776…

MALICIOUS

PDF

69.2 KB Created: 2021-09-03 23:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 884b743355e5a3a3995413c680972e6d SHA-1: 3051c738f498d7337cd332987690498a2533af89 SHA-256: a6e7506c441b17769c90f8b08b4c26dd530340d983325cd4048e8f9175fbf21a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7816

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=hotron+hr+100-2+manual PDF link annotation
    • https://noithatkuongthinh.com/uploads/files/40367428851.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/368ddf587c6ca03a3d774762d8a73d65/69470335739.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/50v591r0gg9de61dv5rfh185jl/xosonajofulujetosupef.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/67613571631.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jetawojuzasonogaw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/varilodazusikekorigefewum.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/54745743597.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/pidosew.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3600d643---7345388677.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pavixutafofipu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092d578f2e50---47554272508.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/siraz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5fb2c5877e002c5716311331f9340f50/56611581565.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/41595821024.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/govuzazowividul.pdfIn PDF document text
    • http://parilka.by/var/upload/file/wevapito.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/tipumelobavemugogave.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/7974798758.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/joxowiwokes.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/094dd9f435b6b3d2c3f8fcceb1129b01/vojawopejevola.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d1696def---2946187919.pdfIn PDF document text
    • http://terrietanaka.com/library/files/74294214534.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f34e28e841101491922d7f9e5664ef6d/8818285680.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/62162736715.pdfIn PDF document text
    • http://sb-78.ru/files/file/9475180923.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 18304 bytes
SHA-256: c1b2f94c4ea63391545da850ca5e5432c742a19ca21749fcd7dfef1ef98b40f0