Malicious PDF — malware analysis report

Static analysis result for SHA-256 feee8058cfac3efc…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 11:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4f706a03404324ae7bd42b329487b35 SHA-1: cd75ae94d7ae553bf0dfca53a7f8dc5c02967c96 SHA-256: feee8058cfac3efc8b3c01304380b4138389206049bee775efba8d3d2a845b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb2227933---ruwugowinuv.pdf In PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/87478383965.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/20817880117.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kabovapunulavatiwagu.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/sapewowajivugijafisi.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/resen.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/50462541174.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2nfu1350bb3cp9mfb30hfhlri3/bevum.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/waxesoje.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/75993153188.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/rosixoluzobotiriresozof.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/paxiwav.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/93755343219.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb55c88d9c34572f5277c804a5460850/zoxedenigutusasidonituge.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/potej.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/80442447346.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/4054781213.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/wevozujebeviwiso.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5534bee1---67635771874.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/86852203738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=theme+chrome+blackPDF 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_off0000b0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 17516 bytes
SHA-256: b6a89296e3ec5abbc8dae649d5c99c86b4f775fd468020214b9249517b42f411
font_02_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 10228 bytes
SHA-256: ebc3d18e566984c7dedbd7e5a063269fe08e824fab4176969ba50366caaf2762