Malicious PDF — malware analysis report

Static analysis result for SHA-256 6106fca5bb9067ea…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 06:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d6b3403e054a9051acc5c2ee441afaf SHA-1: 4b784867d0d781e330222c7bbe43fcfb6c9e3aa9 SHA-256: 6106fca5bb9067ea587e1602731a97df6e4adb2f21762d90f4575a4c469bad76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=what+are+hit+dice+dnd
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/24e527639a9a4be18506e26273fb0d2e/lobotoz.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/zuvidamisopepe.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/nbag96b774av6vnllr3a8lenso/tikepokepasirusuvobapu.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/sivavigixo.pdf
    • http://derkwoo.com/upload/editor/files/nawuwodulozigefivig.pdf
    • http://bmsorganica.com/userfiles/file/bovirunaxetovorexi.pdf
    • http://thuexedanang247.com/uploads/image/files/nupil.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/72oa69nmlvktu4mrsabng8enfo/79511090006.pdf
    • http://banghetretruc.com/media/ftp/file/xenaxijodabudi.pdf
    • http://auto-spec.ca/fck/file/31702065489.pdf
    • https://nadamasristorante.it/file/ruvitaxiliretoxuso.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/19b94ad22d90a94b78d5b858a86912e5/16246585185.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6b0da5a0---pajufokanupoviz.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f6d192453fff25d7966aae1abc26e84d/feromipomexasujeragegesuj.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085117f9eee1---roxeduralijodewalew.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8d0b8ec212aa4fb47f3d3d090af7aac6/rewesunamusaropokuwubon.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c06b612ad4cf6a5a8e98ba5a563ef119/8424822361.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a95882c4---suxugawusix.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gomezezowu.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/11616226716.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7307defdaa3289a1cd84f5b1e9366134/jajexunuke.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad0b5a3a6---88150463099.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee13.bin
4c1eab8e61bc38d01a5a4277173ca2b9d42b9aa8674065fbf60ba6c8566ff69b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 10128 bytes
font_01_sfnt_off000104a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
font_02_sfnt_off00011cb2.bin
85cbac6a3f3429c9f58da27e0cc6c876fe04cff8a8836fc5af9288fcdca27546
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 17720 bytes