Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85fc20d2bffbabe…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 15:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9970ef18169525eb4b59fdbeff4e58f SHA-1: 2389de788181ecad25e0a7eb8f28f8eb166563db SHA-256: b85fc20d2bffbabea064c0b4337aed4ebeaae16ccbfecafbf8cfaae5bd82e269
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to link farms hosted on compromised WordPress sites and disposable domains. This suggests the document is designed to lure users into clicking links that could lead to further malicious content or exploits. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://karate-talence.com/newsite/userfiles/files/jupovad.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d413e8743---50231910023.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/zipefozazawezuv.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/liwuwoxitewukojam.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210926121703.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202110030546471598.pdfIn PDF document text
    • http://dongphat.net/upload/files/27190401920.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/65696939575.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/tawuxixanolakaza.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/romefepejikom.pdfIn PDF document text
    • https://hyper.vessty.com/_img/files/sixabamesufokujasad.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/samipijilevenawupasojakis.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/nodini.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xozomenutowivupuwaduwox.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210924124818.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092813054398.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/42519092842.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/67403c8ff7c046bf4d23a5e86b031b04/42814490500.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/17981765890.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ba32b2751---gewofekarelije.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/90811919688.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/91035064206.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/34416961452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=change+drivers+license+address+wisconsinPDF 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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 16740 bytes
SHA-256: dad71c973f66e2ab6f8f7013dd832a59c0747381b2c9584f80c9371b6374045b
font_01_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10732 bytes
SHA-256: 0d03e2ce4d05fa5b30c48187413fbe51c279a864ff98c5e5cb970804e122d389
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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