Malicious PDF — malware analysis report

Static analysis result for SHA-256 640db499f4028fa5…

MALICIOUS

PDF

76.0 KB Created: 2021-06-15 12:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e722c3baa96bc1e63ceafe3dacf32550 SHA-1: d212bdd81947e4cc13c184b8ea69dacc7b24611a SHA-256: 640db499f4028fa515e58e0120473e8b41c0a7ef1e5c57fd358c730ee3db799a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=how+often+to+dogs+come+in+heat
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7v0k862n7ffem8siqlr0k55vbg/96515975951.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/cfbab3a646a48dee6074a3c2e9e2f204/88832688692.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/19966d5f568cd04229cb3feb4f94d82b/22911908309.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39ac415f2e75dabae5ca584a3982e18b/8131178431.pdf
    • http://qtjdb.com/UploadFile/2021/05/22/file/20210522_120341_138.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/63bd1cdc0af3f5ee574c43ed1b99f74a/86268164178.pdf
    • https://tl-systems.hu/files/files/nukufomirima.pdf
    • https://serwisnawigacji.pl/userfiles/file/2376891261.pdf
    • http://daoltrading.com/userData/board/file/vilotiv.pdf
    • http://cartonwrappingmachine.com/userfiles/file/nejibigo.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/31003302077.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b08b2355---94880251307.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/506d51601696661c256f390c6b7318e5/timinenafesenuretigewojo.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eg84km93mdmi6qi9jtd68gh7gc/vawofowupepubasuxufora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3d.bin
fa4f7a99b4cb609a875e4b1732243f2e3aa48ab1884c525df6fd2cf24f12b675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 5360 bytes
font_01_sfnt_off0000fe70.bin
d0c1ba147df5d2e49aa38861a4663bdf59426069170c50f7e0fef8a4c42b771d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10636 bytes

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