Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d04230af5b7d34d…

MALICIOUS

PDF

93.6 KB Created: 2021-09-17 08:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d180c21b3c6c0b1eba95ed12727bc28 SHA-1: 2098399dff8a5a0f318fda3b6aa3324f73abc825 SHA-256: 8d04230af5b7d34de9e774cfeef82530c1e1d44dca274e8dfa8587f704799810
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a payload or phish for credentials, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=7+letter+word+starting+with+bu PDF link annotation
    • http://fixafilm.se/userfiles/file/84562192070.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/vilepuwaka.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/78de9b30798970eca96f19100872c440/83840388191.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449be8f52---86790083320.pdfPDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1b85e28e06dd34eb5bc2344d90d1cc22/30081379926.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2747889c0219b5eafabe5dea9192cac0/bigomobeligem.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/22043804952.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/50634125428.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613280ea7b3ff---reranekenibonef.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/43916245128.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/11890576629.pdfIn PDF document text
    • http://mweb.cz/images/file/xixemum.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c76905ea7ce169a512e92bd280dd2687/raladavotarora.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/radiruk.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nagisebakoruwikas.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/nimozakelefibubozopumiwu.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/borej.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/89013130267.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/giduna.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zewakalo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427390b0338---53459683817.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/lusuvejatesizobez.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/52115955457.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/56146309986.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/gudolibuse.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132527e31324---woganesafuxuxil.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_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10808 bytes
SHA-256: 8efa0ebd957ee4a19dd347ce99a0f9f86b14b1e651da7cce03a92ddf93695e62
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 21268 bytes
SHA-256: 1a58b3e4af0068f73a57780be1051ab835fdb1d1ce40325061b2ff5c6e50845f