Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6dc95d80f25dca…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 02:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffa705e7f6c22d826888763d2a7f426c SHA-1: 9594e351894ed686983697fe3f4a6463da80059c SHA-256: 5f6dc95d80f25dca6929dacedf5917c383ccb3e2f4d6767b3b11f4a6aed92bb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm hosted on compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's intent is to trick users into downloading a password-protected archive, likely to bypass security gateways. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=abrir+archivos+cbr+android PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc1635dc4---81288585806.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/26705300038.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/97984169858.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/76447657019.pdfIn PDF document text
    • http://protok.pro/upload/files/zejat.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/woraborusuzalorarararov.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fixixewavewinaramefav.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/razojowij.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rewoxozuzenapekukabenug.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc442e3f27---62605337217.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/ganazejitaguj.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/favunisukamesevago.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/gajikozupakikakoborejot.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kikawulak.pdfIn PDF document text
    • http://hkalc.com/userfiles/37259019932.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/wepolutizuxiz.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/72444285550.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d23932ad6---92942472149.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/xobibuxoxa.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/99981553841.pdfIn PDF document text
    • https://langumeistras.lt/i/File/ralixisoredadifusis.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/95764053434.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/32074252114.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/sipunebojakemedi.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/97213383703.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109031146368531.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_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 17448 bytes
SHA-256: bf57cd84955d45754d4d1299b741d5fa48f2e354a87f66050cbb3a8cd430d2c4
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 10380 bytes
SHA-256: c077856c5df293752431f57a2a8ee1aa2779fbaf32f368d9d1a2d08ea53124b6
font_02_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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