Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fa96c1921e4270…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 17:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b7b9867e6f6ee7c388701fabfaaed06 SHA-1: 02cac0b5be90d3a30fd0e8e14d15687d1d2000a7 SHA-256: 10fa96c1921e4270540fc4a64f6c72e98310b88a28d103865669618096300a9f
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to external sites for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7749

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 http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c664ddbfd88---sazulimozubote.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cecc1ab5---19650376322.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pp3imqsa8gmpb6b2c0akgj0ul1/dikan.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/fovob.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4461ef3447d64c9d387fa870db977d28/xezoxadupesux.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/jokixotopibap.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/dixivax.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/99b105061d94c0e65346c8a2fc09f3d6/pedisokepunugapew.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888cf0a215d---60307505738.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/pamimuzosen.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dca84a2477d---sedem.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/zupaberoru.pdfIn PDF document text
    • http://vce34.ru/attachments/file/919133224.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/kajufagedufiwe.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/68986470149.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a1a42272dd951b0811d1babf81f9225a/galojokuriwefasode.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/76513088398.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/damefixij.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33977661581.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/91811555045.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/bakit.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/jojebowupoge.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/87391984962.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f563f8f2a40358ba975b9cbeca4e236b/nalumowodufujivolix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=worksheets+for+nursery+shapesPDF link annotation
    • 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17480 bytes
SHA-256: d3fad03b222e8e306f938fe74e73a9674af2ac99e46550ce672c9fa6352e34ed