Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257f1c5c6281f68…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 17:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-15
MD5: 6cb7fe6f722245dcf0317c2e1a4fcb0d SHA-1: 53da9b0f99af949ef352fadba7cd8e482caca244 SHA-256: 4257f1c5c6281f68505031315ca5720d5c07a993e57c7bb246b8fc4c2226b02d
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fc528b60e---14918057420.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/bixedivagokiwexanufab.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/rufemezoxuloxetuxarevelu.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/73920028725.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/64382294200.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff36de4db2---61557842939.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/76676780675.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kuxeripokasixoxukuxojas.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/katijaxizabojovovulem.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66789531016.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5dea35e5d80c2b3da347e46d0f262061/kunubozijabubozomaberor.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gabovigusanizi.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/nufikafonidar.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/tuwivuji.pdfIn PDF document text
    • http://paliukenas.lt/i/File/tosavi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b31aa66a9f0---73036664323.pdfIn PDF document text
    • http://screen.by/images/file/xudak.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/77a39nlfhicgop02rg3rn0l7eq/xubida.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/82173945729.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3910cb0707---sovaginivotajabobeze.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/nivegabakuj.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607355b302de0---87882994911.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3e3590ee3767599be6824d72a56f8c49/50509207098.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8801d26d853e3e0ee74db7bab7d2c966/ruzikijilanaxu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/94327265958.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e72184f1f9be931dbbbf965c9f0a2607/razadomidukoxefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=libro+de+geograf%C3%ADa+1+de+secundaria+editorial+castilloPDF 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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 17224 bytes
SHA-256: 27d2142b8c2c409d9a9324259537a45f913eecb78657b049d18aa832cacfedea
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 10964 bytes
SHA-256: 5e69d0d75ee76beab9fccca4a79c70fdc8e61d22ff1da91823e8f4f1b6ef2379