Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b99f2d1a07c53de…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 07:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7a48d0536d14baedc7c9e5d18b66811 SHA-1: 6b43decc2e04c377237b1f8a05fa1a90c8575bfe SHA-256: 4b99f2d1a07c53def8e3c05ea99ca087b3ad5c2ad3d3c2d69d366ced013e4e1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bold-iot.com/uploads/files/202109121151356884.pdf In PDF document text
    • https://gestionarival.com/userfiles/file/69031866402.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/vibufovidonabo.pdfIn PDF document text
    • http://profstil.az/userfiles/file/pamifepole.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/79797690715.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374eebe4035---setam.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/kudamufizekejojabop.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/82841579562.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155db26018---50822049702.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/zoroxupe.pdfIn PDF document text
    • https://slide-bearing.com/d/files/20606056020.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132eea5cb6dd---foxijodovikinaxofitome.pdfIn PDF document text
    • http://klpa.net/userData/board/file/depipixukatitu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/094c4643ce9d5f52be46dc6274d3aff6/kosowubibowugokemoxebusuk.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/71087058097.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/puvib.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/bapifalutozudotofet.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/74283306238.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/sanuwu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/68484814949.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/tibew.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/mikoroperukovose.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f1d9002a247e9ea63b84e140558f7db3/rejomupowusiximanumo.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/wavajej.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/wabazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=term+for+a+misfitPDF 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_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 23748 bytes
SHA-256: 7eca27ca3f95efad0672550115d983afe8ad2e3bf0358542fc2e82c82f725181
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 10188 bytes
SHA-256: d784314b2d6dbbd90c15aec6ce8da0a39ebbba80ff54dc8a1ea8f39f8b1c79ea

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