Malicious PDF — malware analysis report

Static analysis result for SHA-256 b814d8e390f5ab8d…

MALICIOUS

PDF

66.5 KB Created: 2021-09-05 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea542de1a81116e931d039ef685de51f SHA-1: 5a314c1e9e7a1c876eef97d7b7ebff96bdd07e6a SHA-256: b814d8e390f5ab8da6bef3200cfc3f02e0e445619416aeda0ed1094e1e252ef4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5224

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://medvor.ru/uplcv?utm_term=sindhudurg+district+map+in+marathi+pdf PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b037d223c5a74f4426001b2cb3b7d980/dalabezexivufazix.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/20573781263.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/zexalokefa.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/80403432243.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/fudiz.pdfIn PDF document text
    • http://sooclose.eu/upload/File/15123962665.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa19c5c67---68063890045.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/246292244.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/59550790535.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/71029512937.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/85088876961.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cbiclg9bpff13bbvoo4ijp04bq/xarekipakovurakifatudim.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/modijizomatomizos.pdfIn PDF document text
    • https://atl-50.com/files/file/rirobaguwewafoj.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f62a07b0a13---15380422223.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5a99017b7c2cd869b115dc3654d0dfae/57532642281.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nqkoj65p6bhg9si70chp161aad/9053696382.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/kojarekajilogerodivo.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/tenofevuted.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/29000574f2e9718f617ef67f2b317ec5/81187927770.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/28754485548.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9382976387a2186f9a0753791cd5ec5/kodasix.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/61936999725.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1emtc4khqtnia15rismjg2dmr6/74639353852.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/fivigidopujeruk.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080815440570.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb67b0b58---88365359841.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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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