Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd129d8681677e0…

MALICIOUS

PDF

80.4 KB Created: 2021-10-05 13:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-26
MD5: 4db66cd1d600ef1cd478c1e4cd28a09f SHA-1: 6dcd4a05ce30c869fcabbda643fbf28e9197c031 SHA-256: 3dd129d8681677e046d6045dabd91256a619268918416f332365dd50cb3e9a6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=he+argues+that PDF link annotation
    • http://dgxzz.com/uploadfile/file/dorex.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/lugipa.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/deruxujur.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/98367870349.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/43463635300.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/50626722440.pdfIn PDF document text
    • http://lagrupacio.cat/file/13697092339.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/8061105942.pdfIn PDF document text
    • http://tercovci.cz/files/file/7393697479.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/vovubaroma.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/ralixeritexaxalem.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-28/20210928115557321819.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7ra0vdtcojjthunhlml94rht7e/bidorewonosatenibodafom.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/fanovizisekajifel.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/6266383752.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/196d82d823bda60a90da34aa1c089742/davazofuti.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/62012878173.pdfIn PDF document text
    • http://zimmerei-possert.at/pugujikef.pdfIn PDF document text
    • http://minhanh.com/files/54400133969.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vusumenezevevi.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/20980703266.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/95941841572.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3d1a337b9---22759439478.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/37905553302.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/gutibosedovuvesalalisitew.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_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 18264 bytes
SHA-256: fb4fb78442094618cc219d44b218e110406156f387b419775b388da6d9a3c229
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 10116 bytes
SHA-256: 51041e85d5e1dd6c11b1828dfd4197dc36b4387f6ea268619040545fa2938691