Malicious PDF — malware analysis report

Static analysis result for SHA-256 69539bb277e319c8…

MALICIOUS

PDF

82.7 KB Created: 2021-08-15 08:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 20937661b735f0e708b6a12bb7a1dd33 SHA-1: f21fa3f72e7569d45a7decb70a2f8562f216767b SHA-256: 69539bb277e319c8580d1c2878c354495b31da29626d7ca8479ec434245bb956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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
  • 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://chandrakantmusicacademy.org/ckfinder/userfiles/files/rogurevejesakovez.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf1ba0b523df3a9b9204126d346756d7/niduzazetineli.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5845d6e4fb---21529514843.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/94423736177.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/75f3f54668b596bd54f20736b1a9f446/xolorosopisuvejuwiwewi.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/97624764985.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c76bc980b---suvawodusalu.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/91715375952.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4a23c08ab9f54938d18da180fd231bac/vobovesuke.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881bde028c4---29823086328.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23e2b9cac---65451039385.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84565d9a4---78006192051.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u5kh5o6aetccn9df1dj2uedbb0/75900834458.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a50cb2dd7cd45eb1db13d9b5a98490bc/gogusovononabajamadeki.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/ribadevofebib.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/87384237220.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/83129941755.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b950040f37568832e65d3f852e97a907/7652239461.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37f232b45---84016472496.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/94nnnlcrcas9sgqjl1su45de0b/rasosebajunifapifevom.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210803150502889.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7b25d376fef7c9b339b05484a41949ad/21089730122.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/bukepinuvilofu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ed1f3f85---79624752462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=estandarizar+naoh+con+biftalato+de+potasioPDF link annotation
    • 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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 17980 bytes
SHA-256: a1cc9216d75565d33f1dfbebcff8f39479c6de1ea7e8d1e3748223367b1c1100
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 10900 bytes
SHA-256: 9ece92df31a9a4c5f0bc5b7ca632d7e106fb860169c04aed00aedaa14c3f9d61

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