Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f83b81cdb41200…

MALICIOUS

PDF

101.7 KB Created: 2021-07-18 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 387061d3ec7a07c8b008d876878eea8d SHA-1: 18bb801f5c141f933f5ede54682de52523f1a023 SHA-256: 26f83b81cdb412007c82ed46c5449df558108c281f74df8dfcdff7a4f039accc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://3eyamaichi.com/upload/ckfinder_temp/files/20210629212535.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac661784646---60211121627.pdfIn PDF document text
    • https://le27.fr/docs/file/siwoxifofelogosejeku.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/28859478269.pdfIn PDF document text
    • http://954move.com/clients/4890/File/74154903343.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160777cd5d749c---88578668702.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/duxiwuteligiriwasireros.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wowabasufifagonuwumisagad.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/93439110322.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c70c0471---896433043.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21457130b---lexugomukapoti.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o97rtq1mbae123lck7iiu8tmfd/bobazewivorovebima.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/26602009105.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/83557487636.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/75228635993.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2439441582.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043e326381---26607666851.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/12620023933.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/51705786346.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/tikidadatezosutuli.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d864712a04b---3577288647.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/17700240562.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/72592845cec1a05ad143150e090f3a68/16008248033.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3ca395228b41e0c4a37c2f99ce19704a/jevuzoripodamuxanezurexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+eat+rice+everydayPDF 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_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 17604 bytes
SHA-256: c5c59e6b58e143a4807b0bceb5fb03e5e700b9baab19247e56d1fbc9f7c3885d
font_01_sfnt_off00015801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15801 10460 bytes
SHA-256: 8a5dd59da7d54f483f3144990386edd9e1b647805efdead3802e38b8d7df846e
font_02_sfnt_off00016ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1