Malicious PDF — malware analysis report

Static analysis result for SHA-256 956550bdd3650519…

MALICIOUS

PDF

67.9 KB Created: 2021-09-05 09:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae7eb5f34aa37510cfe78dec09376d4b SHA-1: ac8b465e611d9a60ba85584c5c399d871d080ab2 SHA-256: 956550bdd36505190b7976e779d1ea0e2734f7f28365acb09435ceb67c3e36f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple heuristics as malicious, including ClamAV detection as a phishing trojan and an ML classifier. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the final malicious destination by using multiple layers of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9448

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=aseo+perineal+masculino+y+femenino+pdf PDF link annotation
    • https://susta.vn/userfiles/file/88892976785.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/kunozeroses.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/73143973639.pdfIn PDF document text
    • https://megashina24.ru/files/files/51388386462.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/13947917742.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/60701647107.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9930e25a2632d671e5028c9717fd3d78/wisesososivinexak.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/91204252637.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/3cb1ae5a94c9011c67cdfa615b407a05/pulepolevofaxafadu.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/vusubosakififonozugaki.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/66fc213eca74a13f614481fbe86031f2/vakowuzunatusemapezod.pdfIn PDF document text
    • https://teddybestore.it/file/gipumokozavavitok.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/diserabeni.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/dokamuju.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/1721479655.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/beketamigaf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0fh3h3kfpnasuvnm98pp8rb69b/95821791231.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/88d2af00b3e86a5fe9e95dd2df1cc9af/papowowon.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/63907404640.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/retar.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/30212349577.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e28ad940---19623834516.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121bbd0caf5---zotibolupolikufamimimuba.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/71692758929.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_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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