Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfd7fcb9b12bd38…

MALICIOUS

PDF

90.9 KB Created: 2021-09-19 08:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d988148e5772bc828e9c7dc22f342c5 SHA-1: b1ff17c35bee606691f280bb8fa1090fde8ca882 SHA-256: 0cfd7fcb9b12bd3815168d5fc8682679c5f6e3f8bead9c676f02fc66e37de30f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/94a2ca39f5ebd06c338fcbfa054166c6/xifojiw.pdf In PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tunizugel.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gidak.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jifarivupopor.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410bb27f82d---91291814189.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/8600158756.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/8557448210.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/75041591932.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/gimojukobodatetanurusadi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48111621003.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/15346149900.pdfIn PDF document text
    • http://vinmexindia.com/uploads/duwixukajok.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/021505807.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/rujarinifidufumuwegoga.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/regolisilupipixumid.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/jukalasapom.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/46931935003.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e209bcc2e31efb10b6a13ef11f9f92ff/xulalutegokoximaxojoroku.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e92f25826---tirejiwuzofagonese.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zojajerevo.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/rurodafi.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/52306140855.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/92613136416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+offline+money+cheatPDF 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_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 21204 bytes
SHA-256: ff1f6bfe84b865cd616fcf7daed7c64edac05e982dc06934d89e4d4607df7f60
font_02_sfnt_off0001463d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463D 10552 bytes
SHA-256: 5664a57d99ed533bb16e8d2e0b0c2bd22a8182fd3c7b2607b79710218f4aa64d

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