Malicious PDF — malware analysis report

Static analysis result for SHA-256 430690a09c26c36a…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe7c4aa4ad7ce94a0aa9076fbe8462bd SHA-1: 4f5a0fb909c8c20df502745329f545a6bb9f8015 SHA-256: 430690a09c26c36a813be61cbecfec7e697d396c7e779b2ae4fae7ebb1ab145a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of multiple compromised CMS upload links indicates a likely attempt to host and distribute malicious files or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b025bef9d---50431865599.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ar28dn8jgr3rl0jphn2abvfc7e/kasuviz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab90b28f97---12884821525.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/2512628732.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/64899991884.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a7de936b---batosopafelatazavag.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b60eecd77f4---5587769194.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/botoditawiv.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/dixepis.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff86669a62---neruvinadevibivope.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/60hq2jolot8p8mbjh4ti14mapu/zezanirekenar.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vhpjdb9u281iaii5c0heab4pk3/jotijixo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021061013323777192.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/6826035188.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4evvo1dgo10ih9hpos5hhpro36/50003173824.pdfIn PDF document text
    • https://olterus.info/contents//files/27382831924.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/xolewevujuwavusodufeduw.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jigevawute.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/s0iffsoihbfprvddj0qfuebip6/36046360629.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/febib.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210624034344_939728791.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b364c28dc---25740859825.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/geborutadikamoxasosenenev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=scary+town+namesPDF 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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10528 bytes
SHA-256: 13257570aa6a18d94d44b7923d7b46cb4a2eb54b4789079087a197f23ea394af
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 16492 bytes
SHA-256: 2c24a1f068181bcf2ef45325a21fcb140d03397b34a7641e033584da690dcadb
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1