Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bbc3b42d5efccc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 00:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c708aad453edfb0cfd9a159078612c3 SHA-1: d89bc6b9f9e31cb3c94eca9d8fd5dd51a971c212 SHA-256: 68bbc3b42d5efccc64625a15cee830bb93450ad7da6c468092b1e071a6b9bc49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/derutezekegagapujovitis.pdf In PDF document text
    • http://studiodugnani.it/userfiles/files/1502900694.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/poxej.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee8910bdb---nezove.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0e6be77b567de97e438e0ab89d31fa5b/jelojurixab.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/46890532722.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/r622glkahanldll99grrgdaoe4/26321059515.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/gofonefokov.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/76223512895.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/39953589121.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/97870736134.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lorazajuxidenuwerunesego.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/luxizebogale.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/9055882199.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d339f4f0---sonuvifel.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/risopesoxotopuvebape.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/37371630431.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/95690736511.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/javuligaporuzeke.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c9c19704---jeworajuzakivamadojenode.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7uo8ebptqnv2trr497cjfmgg85/pasome.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/mipozedepe.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/23ea35ee17119ccdc2d98e9cc864fe2c/nomatokozela.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/dofofukapawajugodisip.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd84a7d32---zazopubagezuk.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qof4pjh43hl6iv0c282fs7l3al/pakalilaluvinikaxojopifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=expanded+and+standard+form+worksheets+grade+4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 16864 bytes
SHA-256: 6a59938bf4f8e6a42f06b8812c35b900c7e7775cb2488a5637845fbe23abcb13
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11148 bytes
SHA-256: a7c2eaa74aff44661dc2d8a1431241ac5af9351918ac1c30c75a398857d35267
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1