Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6796aebb2078ca…

MALICIOUS

PDF

72.2 KB Created: 2021-05-05 07:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba490d3b5e40fc79f5143a902f5672f SHA-1: 2f9c5a9c3b79ed85e5ce5c5adbad3876168702b4 SHA-256: 6f6796aebb2078ca41c979233d73e08cbefc70f1bada9e286c4223ae25dc4e1c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90f2ebf4d---34333022307.pdf
    • http://aliglobshop.com/userfiles/file/27025670729.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/r2ebn4ie61ggfnaa62i6qkfc6n/33754502619.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/usg7u08agne85ugo877s3fkomv/vodunizu.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/61ca52ddc15fcb6e02f37c2ebb10e385/jijimewopinanalataled.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f230a3a1e6---veweg.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c11dbe43a---29241221944.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qj93tnch09ddoftu0uog0dkodc/95865325762.pdf
    • http://animationcoach.com/userfiles/file/pujixazabinuwazix.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810742877a7---34589013673.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0436d2f7d---82006157938.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/99575221952.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f172a1800d---fadunebo.pdf
    • http://anthonyvienna.com/sites/default/files/file/vidawiside.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ef3e9b06---bavuremuxaparu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=powerpoint+templates+for+teachers+the+classroom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded6.bin
698ee04869485c080099514164d4f05650ec217508f13c635f76565d712398c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 5348 bytes
font_01_sfnt_off0000f0ea.bin
dcbd889009045426135278f58fe1d8853be46201d0b160e0aaf1a5261e69c2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 10204 bytes

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