Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da8506920359e7c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 20:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d060ec76cb5a6d18405f5ec9b181fa3 SHA-1: 8595c8b9794fed124d2736a6a6fb9acba82e3638 SHA-256: 9da8506920359e7c1a96dd9ac0a8bf4e1c07f654e504966c139ee917fc8a0830
154 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through malicious redirection, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5372

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://spakimthi.com/upload/files/wusenodopivupasogo.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c85812b8---biworazovijakafisun.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kce3cis0jksrihaodd2kaok9h7/10681450066.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/lisatipabekuvifabomafifit.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/92923671125.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/6259281403.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/bupipipejugaxuza.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2f25a066fc10eadfe16bb507a434382d/pawubitisigeposijefex.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/19463592208.pdfIn PDF document text
    • http://thaide.org/userfiles/file/52245657416.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/kajamajonu.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/3223458686.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/fegepot.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/tidatod.pdfIn PDF document text
    • http://apsons.eu/files/file/vuwozom.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/12698429854.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/tapowenojiligifuzuz.pdfIn PDF document text
    • http://rayer.cn/d/files/zuwonapevilo.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910095454_xb7g59.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342239a9cfb---poletixupegukedo.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/relupidoranomepumelovoku.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/rudesagegolixuzixojaxedep.pdfIn PDF document text
    • http://agavietnam.com/img/files/54079595911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+can+you+leave+marinated+chicken+in+the+fridgePDF 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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 11204 bytes
SHA-256: 33498e77d0383d20377486b3c188161b54c61e276b89201e25e4dfdf53460add
font_02_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 17480 bytes
SHA-256: 16122ea704b4c8f359d13330ba7f46386ebe1c3a2bff70b02af4e304c7177213

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