Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0625ed1d8a7135…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 01:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1241ca69a17e8a62c26f58f5578c31ec SHA-1: ddf916b73c77338b9cb2ce590acabcc599a8a78b SHA-256: 1e0625ed1d8a71359721aa5b028132482ec24d0df331434ff498bc912796a191
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is a social-engineering tactic to trick users into installing malicious browser extensions or updates. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ck-kutnahora.cz/gais/image/file/16357999539.pdf In PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909063426.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/mivanomasefegepa.pdfIn PDF document text
    • http://hasyo.net/files/file/69882840598.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/87704173630.pdfIn PDF document text
    • http://thevalleytrader.com/files/94201943041.pdfIn PDF document text
    • http://metabolit.ru/files/file/3545312551.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/zuriliwepijiris.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/98012696380.pdfIn PDF document text
    • http://polkovnik.su/upload/file/jojelowugifegavojefaril.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/24604309902.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/77584112603.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1695a5fd6---51682567503.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/kujepetetepezesidabog.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/46905807320.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161347ebd9b543---jajopisatavojebefubi.pdfIn PDF document text
    • http://119pump.net/d/files/wuriwonitezeserubemuj.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/26542283655.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/bilara.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/wukakivimexurok.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/29706755548.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613344df527d6---jebuxakituvamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+print+from+chrome+androidPDF 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_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10748 bytes
SHA-256: c28e950e70df4ea754a8b4a8f6af95398f4abf60aae25b2ef178d61b8db43eb3
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 18172 bytes
SHA-256: e34c509e4d62253f11becf3e9d990faa0ff2543802905945ab15e705cab851e9
font_02_sfnt_off00013cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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