Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5e9f4c9a39d764…

MALICIOUS

PDF

81.2 KB Created: 2021-08-26 04:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c2ca47122020261e031e51981cb0423 SHA-1: 6d13630ad610b20412c66b98e0587232829a3cf2 SHA-256: db5e9f4c9a39d764f41225bd13f81860f5cff87778f898c20d986e934454e9b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm structure, as indicated by multiple heuristics including PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, strongly suggests malicious intent. The embedded JavaScript likely serves to exploit vulnerabilities or download further malicious content, while the link farm aims to direct users to potentially compromised sites. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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
  • 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://anhuicrew.com/upload_fck/file/2021-5-18/20210518043314610542.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3fc50799---xitesimemizi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fjp7jjlblhksoef004qcnho8ve/vojovazidebapezudav.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ba96106f---talululutigoka.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/65425998794.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145dc6c366---balodogivalofozij.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8833ea07cc---dotugegadozut.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/34331684214.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7bdbcfc78---19644563922.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ql5jgasg5s6klqbh2qpnk6obj0/sonelofaza.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb9bb9b26---mekuzi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/65300307730.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/kabodeparovujitifo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2431edbf2---50269522321.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/92254894277.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c646f6e573---89367492930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee680192e5---jasefisixitukumu.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/wilituxe.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a361dfe68332c5fbe2ca76f7b6c0ecd8/nasaginasitagod.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/86025554468.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea8fd69cb0---rujejesetigas.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106010549145401.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4d7a0976bf17ff53eb860f527ddc8d93/pedegimopejozudofavakab.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/tiwiw.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bcd661add95798067b2747d88c7c30d3/bovosobedukakidukageguj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852e2de8a9---68875801078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=well+sorted+sedimentPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16140 bytes
SHA-256: 3f6e147c50bba0ad28940933cdc4a919bc2c78bd3c8c1a120d600609c9d407ab
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10240 bytes
SHA-256: 0f306f160af017b79a16a93e427417d3873e9f2893223b0e9d192512a42a09fd

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