Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba8b05e29fc3f5…

MALICIOUS

PDF

62.5 KB Created: 2021-09-05 00:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bfd3facf1174e3a901c0389513604c9 SHA-1: 8e7df7499592b04982b4b52cc43814a383b977d1 SHA-256: 81ba8b05e29fc3f5c0ae892df17b5f460b9e49419bd18f562ce56fffb5b00853
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external URIs indicate it's likely used to deliver a secondary payload or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9100

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://infrive.ru/uplcv?utm_term=ict+p70+bill+acceptor+manual PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1fb05d064---mudoxoxuranivubuf.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/70646108308.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37374307846.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81013206801.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/82b22bcd57a1891759afdd37170686a8/xufofexujimur.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f28270d737---56905429076.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/sawemurikakikex.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/50966241466.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/65989773107.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/75891174476.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0jev1dotcplv55smj774o8997n/92390281383.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ih6tsdp175ttcgrs7vrvk2hif4/97328378073.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d407b8a8---13478558073.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/c32a3q80c0hvc3dlg0bldhnim3/bizovifojiwov.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/nexedewi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2553bf6a16ce914e985983d06e29114c/96030221320.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a705c9e286c---57694542761.pdfIn PDF document text
    • http://guchenes.com/d/files/82922767689.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160788143c6735---10138263799.pdfIn PDF document text
    • http://delve-cr.com/uploads/11581644502.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/koloxodaboketubebimud.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161106270cedb9---zuradilibufudumivagu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4591f07d2---51811658943.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/43184127897.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_off0000d015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1