Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6133cd19f147bb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 18:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb4c4f528aebf109ce87a8a9fec1df67 SHA-1: d05558880ee7955e8e899e2e048e67da3892415f SHA-256: 5f6133cd19f147bb99686f0c863a73c50831c402503dff885dd1eb3d370b84f7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8249

Heuristics 6

  • 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
  • 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://www.waetsukai.jp/system/ckfinder/userfiles/files/25652002053.pdf In PDF document text
    • http://montesantangelo.it/files/files/91795666176.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/pomisifedizuratagavoduger.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zetigelawigur.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cad73847---nugagofonarudodu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///runejubelopegoripijamilug.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mosisatusevezimiw.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/19326580319.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139931ed4f9f---37796124484.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/66105940613.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/99584137676.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b27886dacf---46050993410.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc17ce78e---vazudaluwufoparukopamowan.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sukufow.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/ralukarosiwase.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/61013967998.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zutetizefivepedadejoje.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/98067794795.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4c7qd2p4h9s0gei05p4q1psq40/95133489903.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/dijisukaliwavogajam.pdfIn PDF document text
    • http://opersan.com/file/4549138429.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/kefurus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+app+for+identifying+plantsPDF link annotation
    • 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 17988 bytes
SHA-256: fd3949f0ef67324f8291cea4d459961079712e55ae3db00536dca2f853b5b8cf
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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