Malicious PDF — malware analysis report

Static analysis result for SHA-256 66831521cb0b6da3…

MALICIOUS

PDF

93.7 KB Created: 2021-09-06 09:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe07a92403617d4d16c456b98d39f515 SHA-1: 7ffcba27bf5b831a8683da3b0199a8f7d49dd10b SHA-256: 66831521cb0b6da3ff43218ca1d74082b729d3e3861fc5efc2cb886286791253
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1197

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crysiq.ru/uplcv?utm_term=perry+anderson+western+marxism+pdf PDF link annotation
    • http://altelaw.com/uploads/image/file/32126941753.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/sutepikinibu.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/20176553432.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/mizojidiramivadetat.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/kopilekufinetux.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/woxude.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/nanujepozapomaluk.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b040a78c92a9f9b0e7641f8cf86439f1/94099376759.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e80c0b5a16---58534990286.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gizasap.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/eb48d528da7309fe8855b494e10a2ed9/20159009024.pdfIn PDF document text
    • http://opersan.com/file/28506792452.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4b28e008676717b01671e58bd1debcf9/49025455464.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/tabogidibarexizob.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4lgn8v0ei0ceoqejdc2ehglsua/96752884457.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171074291230.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/lowixukojidipiguxadijow.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/71289541814.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/59289593334.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/moxev.pdfIn PDF document text
    • http://1careglobal.com/upload/files/34628439334.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l21bibme2420ui4kg29ie3knft/76607647464.pdfIn PDF document text
    • https://baptistfriends.org/media/26833845238.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4vi1ojidsdopr75md3to6lus82/12755522729.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2a172b58d23d4675b7d3c529be42f8df/vilewe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e92c1d24f15906e2e105e3819eead363/70139224253.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 18604 bytes
SHA-256: 25161fa59aa9f8df66c50c3447b97442cfa0709d99e0db11fa9ed877b78d4fcd
font_01_sfnt_off000150ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1