Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95de98dac364c22…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 18:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1821cc687bd279804adb55e2141d34c5 SHA-1: 357ff7dac7a6ddbc94c07bec4ceff373a4b9e5c2 SHA-256: c95de98dac364c2267a9b69ac59308744a26332585af0a60453d4e2f0fb8d504
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, likely to malicious content or phishing sites. No scripts were extracted, but the presence of many external links suggests an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=copy+and+paste+on+cell+phone PDF link annotation
    • http://odnoklassniki-files.ru/images/uploads/files/rukekobusisirokef.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kanagerovezazanodegixunuf.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/46672733636.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/fukuwe.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f00f22c---33488448170.pdfIn PDF document text
    • https://kar360.com/resimler/files/mawizegabewodumimebun.pdfIn PDF document text
    • http://espokebar.com/uploads/files/takiwo.pdfIn PDF document text
    • http://vitrine-prof.com/files/66422290183.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9bd32f8e5142252de04b04169d521922/juvetutakog.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/590066230cbc74f98628687395256e1d/zivamowagoziribe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614401d968419---88647224193.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9d561e1ccd58cc1aa6734dd1adb863b0/medogov.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/zapuwijavajipulez.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/160kd1n6cmv8h4a0p7rk68v0m7/zonedodesatolafed.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613002aa71d81---zuxijawibixunobo.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/51326264715.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/zufidejopijeva.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///73661380909.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/fozamoxisigudu.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/jotopalitumug.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/35163539170.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/70399499982.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ce7998179a78a87695e57da9c301b858/26563396099.pdfIn PDF document text
    • 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_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10564 bytes
SHA-256: bd7db8abd88ad7c6ea46f366f4c048325bb9adf864005370f0f046a3f499ff2c
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 17928 bytes
SHA-256: 9c6b42287e15a14de57f226fe4ad2a7bac264ed47f63f57ae1ed2f3441d22c52