Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55152c3756dc902…

MALICIOUS

PDF

70.9 KB Created: 2021-07-05 10:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a77c96f7cda9d00d4497ee3750cd565b SHA-1: 998d46d189c6967849b481e38d0991a71a108438 SHA-256: b55152c3756dc9028b63bc782c215b550fa51d75e1900779f5fa082f6a6e1460
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://ketchas.ru/uplcv?utm_term=darboux+transformations+and+solitons PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/af5a8813a38321722a5a3a2aedce212f/jabosivomemumawugupe.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/9mon716a1blq9qg98tkj18mvf6/vobafikanibilujopejuvu.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/312227083757.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bekekazegas.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/kejobubulubadeneked.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xoxugenefuxugekaxit.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5472672b6b---tamepanuwub.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/a0a8942a1524f843d1313e5522516495/94417413670.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2c3f28b3440e116b5bad52e3798f06a6/bofivav.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd45dbde66---widogaxukovaweweroru.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/xegifewojoxalizunegapa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0b638474.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191410.pdfIn PDF document text
    • http://446888.top/userfiles/file/72849697365.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/04d37f6jgu52qp39hna0lushus/pazivofibe.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/9999411655.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/zejazegarisewipowefo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/29941722917.pdfIn PDF document text
    • http://mousike.it/img_ins/files/lupekanitepejulu.pdfIn PDF document text
    • http://cl-pub.com/files/files/bubidesufuvezig.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee9a790fc---44862455116.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607575759d1f6---50255736581.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/taxidanomafekuvesexaje.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/2578175147.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077693d852a8---metefefadozose.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10724 bytes
SHA-256: f31949c867852904f7660bf466b61118bc6a5af0bce790603eb3a104ce00a4b6