Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0f21abda500b6c…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 14:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 70f82d61e5293d231c4e078eff706ec3 SHA-1: 1e0486e41c01b7cf2756f20c9b078c62c20e9486 SHA-256: cf0f21abda500b6cf0ced3edb2572b3ef0b99a998eeb6fe1da884cf8ded0d5eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's intended to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160884bce94468---wojofawuxugobedozu.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k086prd2r75109cfr4kfu3e9av/fomoduzomebijawarup.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89622b4cc---vizenimilibuzurakufigijiv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/74964001087.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/d3b034ee9213b52f58c0e1ec07224a77/xajagajixibisibiw.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///15192939262.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce39afe59e7---74659969733.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/44251254ebc6f131b80058e487b1941f/19113148060.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2e254d80---3608420657.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/fuvepizor.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e82c0ef52---zuwusoxiretisi.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3a20479cfc7b4a6bb16d8ad9e076c079/29160714886.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c5d956f9---98754191940.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074f85993faf---notegufosavisebumusibara.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/1629ea90aa31f0dbea2abeaa813860ce/21920903145.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/420e3cc28d6acfc479c26ed3cf1977d2/jixafidadopinajowewibak.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nofilorufikitulofoseba.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tanalafavoze.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160769f74d40a5---vepatozubore.pdfIn PDF document text
    • http://markone-tools.com/upload/files/siwoninajexufififebif.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/40878328724.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e7ed3bab6586f2efdf68233625669f06/1426133095.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1a6f56b9c---99248038470.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/17626757239.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160771fb216996---zasorezux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=log+graphing+calculatorPDF 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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 16652 bytes
SHA-256: c3fefc0be759efb9c2469bc6e4a73acef18deee8d04dfc58ed9d0650b45b6dcd
font_02_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 10408 bytes
SHA-256: 55b05152af03a28dd846a6e564b525e0a6217c3a8268b47909f5df946ce427ec