Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf77c75d265198d7…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 00:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fd540ba4baa9fa744f429a346ff8eb4d SHA-1: 0d4cf5736736be404781b27b33437e3e7255e99e SHA-256: cf77c75d265198d7448c5ad8065583957bdfce38a5452fe1cb4772bf38b3cffd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing pages or malware download sites, aligning with the characteristics of a malicious document used for initial access via spearphishing.

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 https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/25rdv3p8dghgt7fe1ske3gp1r1/93033273223.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd07da0174b---45163969991.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/22802665bc6245776c87e358bed093a2/1619253683.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7ceda814f5513b0c08e400a1fccfb1d2/99694736578.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/79288218736.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bd784651c25ad2c054d2224a26ee67b/52797289496.pdfIn PDF document text
    • http://stasta.com/userfiles/file/29844298467.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c146a013e0f---bojopilijuda.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rojifudekopixikepo.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/d9de31789a542f617c1809d4a44ce2c0/97415611437.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5afc3da10---45734558593.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c1a27f84b698e419eb1c6d7f8071007/fifigotigewafetoxuna.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/30704753313.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/kokijulibubepekore.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f4308d06---81720861411.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/ravasimemugewibov.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d66bef7c1c54440850899d4812ea061a/kovutubuta.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/51717388644.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5545c8da3abfb6c8bd9b55c354b56f48/17167871740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=example+of+colloid+emulsionPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eccd3ca486806c9b766d019d854867ba/ravakolep.pdfIn PDF document text
    • 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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 16544 bytes
SHA-256: d1e12b94ed6ca83976a4671a89fa2fea92534605bb831b50190f835600cda838
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10768 bytes
SHA-256: a9ccf0c360e09f3133cb35907390e6cf0e6019572c3c329c247d001fb34cfb99
font_02_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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