Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca861b2bc29000e…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 23:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 850903481a3df32c57feafbeb92aa828 SHA-1: 42b231a96a7e0dd7c377ee3283da860eb86e9c64 SHA-256: 4ca861b2bc29000edf4451641ffe36a692854ef46daea69b51aae607a7a8162f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed embedded JavaScript, indicating an attempt to execute code. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely downloads and executes a second-stage payload from one of these compromised URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3161

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://janjoling.com/public/ckfinder/userfiles/files/pajemexelipuxitufufev.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/82b40ef0e0b6eb04ebcb95a847c0a78b/95508014254.pdfIn PDF document text
    • https://ip-pharma.net/data/files/59284057057.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7cbe41a9df753ad6967cdd2f1107d6b7/70067850003.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/riwaguxameta.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f273bc44---90121509466.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/62353891658.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62c4c7f0daed8e62e230708090adf8ce/juposotozubelivajuka.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/56056a32b5c239cc9008c059c58f3055/lubirexugeral.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/89830412386.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rvbn2g41hbpom31ghk4r6829p4/zasolupemelipotasamu.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/bedodufejabatabemegaboraw.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/46527774178.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a69868841dd71493dd5613fb3f76fb82/madorakazexulupupuxolib.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubogabo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/175c45c08524404cdaa0ced6a055bf1a/35235931221.pdfIn PDF document text
    • http://geoman.cz/data/file/wozetotibafepukikifanedaj.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/83088890660.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/35228193958.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/pimegogaxujironed.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210701_E24AE0E399D53EA4.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390122586f---43822336304.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/95223865555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=5+types+of+consciencePDF link annotation
    • 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_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 17196 bytes
SHA-256: 635c534b306c1ef3ff7bfe75112e29bb0cef6782cbd9d75bcb277f51720ce2c6
font_01_sfnt_off00013c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 10316 bytes
SHA-256: 2a33eaaede5a90621748ce59a5952ecd69c2090a9a293ef02b2354305fc3ea43
font_02_sfnt_off000153ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1