Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ef96eae73654b5…

MALICIOUS

PDF

70.5 KB Created: 2021-08-29 13:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c943b10a6eb79e74a41779c8eaa60eb5 SHA-1: 31b4535f704e77ac4674daea8f3cac3b87986347 SHA-256: 24ef96eae73654b57cf00ec8611f480400487b50a936a4ea907534bc204e1ab0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

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 https://feltshoe.com/userfiles/file/86312944603.pdf In PDF document text
    • http://ciskmv.com/css/file/82412992887.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/xidazisuxujazerekukurosu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/71963446620.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/dijutiziginokaxupigasiju.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/kazabugavebod.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/80173803630.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/9440166765.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/zonesowabarij.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/miwaseloz.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/xabutupitaxafiliduzo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xavobukujidapepawoji.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160badf9a93425---mepaxalobini.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/acb205432ec2dd5168be29b15928bd76/vakal.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wuvafavotudi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/62fb2b4e08bf007a5d72ac0e11661bd3/komorugoxuxamevuwudaxenun.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02269f741---21321782595.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/kimalera.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbbad741d0---65603199131.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/4845838851.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/dadaxona.pdfIn PDF document text
    • http://centronegozi.com/public/14969664380.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/92781143045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=static+and+dynamic+network+topologyPDF 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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 11056 bytes
SHA-256: f1591f37f9622b70c5b32e5948c41697cd19ee08d34893eccae3d9a1c3945096
font_01_sfnt_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 16236 bytes
SHA-256: 8f3d4a2c55fd80658a5198b93d82e3cd1f3246f7600d5ee567cf4d8bf78848f7
font_02_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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