Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c1e5d5704f5e65…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 00:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce327354a00d01b6472ecb4a65bd4737 SHA-1: fd73386e4ba5c66d67e71b843aeca6dd783957f7 SHA-256: d1c1e5d5704f5e6545d32a0472fb26e351c71ac86e6d5b353bc4f2663cc08d43
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d4ff106ea---82054645907.pdf In PDF document text
    • https://plasy.com/uploads/file/95685225610.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/nabajomanemar.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160874a35db5fb---92177392365.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qr91kd0lemqug68164adstf671/bazamepawubosem.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d38076fe---15292233750.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/kusexitekasoxodumupilaja.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/fojewumoduparudivava.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d49d7bfe1c85978eed5562f5774c2e2/88344359461.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/f6baa73857261bf69ed2b0657999a80f/ketotujamijiwa.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160907fbb2069b---vogikoxitusurunanapoju.pdfIn PDF document text
    • https://morabia.fi/images/file/24094560787.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/74660947621.pdfIn PDF document text
    • http://coumert.com/images/file/zijadolesanofememekutida.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa2e816e0---dujoremaret.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c75a467224c97330b4c9b371b8f5c749/59450887580.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/84971913035.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/pusoxebuxolunaju.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de40aa2b8e---labirujoribo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3740ujftddam682ofn68rp13f3/94436433752.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f2dbcf2b---46806963586.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/bujida.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/85174854709.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/20865117109.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/sabux.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/22766504381.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4afe28f82aee1df40b3fc812575fcc69/rikuzugebetazomelolozuzek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=keeping+dahlia+tubers+over+winterPDF 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_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16904 bytes
SHA-256: 915e7d17c70cdd2dcca7c5e964bd1b36865112aa3dd2bcb5981a567be7cfef90
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 11056 bytes
SHA-256: d76856f392b92e85bf9d7340273bbb4057344b4a57dbd2e9bd5e47bca79155d4

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