Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba2c1acd5496191…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 20:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c506939ce8e911c732754f43f9fac718 SHA-1: 9e7c15acc65e02c6c57ecb2fa858395ea7e73a89 SHA-256: 7ba2c1acd5496191e0a662390c535e75b2bd8f49db57a5f156e116899c56007d
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and a link farm structure, indicating an attempt to redirect users to external sites. The presence of embedded JavaScript, combined with heuristics flagging compromised CMS uploads and disposable hosting links, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further corroborate the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=rumble+racing+game+download+for+android PDF link annotation
    • http://iknow.pl/files/file/wonefasusutukisa.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109082131274956.pdfIn PDF document text
    • https://membermimpi.com/contents/files/13037973710.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/12872400997.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/57394670896.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/86520951520.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/30578122235.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/radevidukidut.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372290c6a02---65745853188.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ab9dda75b1dd8e286b16d0daa1aad46f/2933907916.pdfIn PDF document text
    • http://elpijisystem.com/file/66510195633.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515ed113c1---67592458087.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7002d0e9---lifavawomalim.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/lawapugasi.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19675362090.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a69a68936d2a242b1357e64223f5f633/65138218917.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/55622237809.pdfIn PDF document text
    • http://aven.su/userfiles/file/50802943640.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614374c3a042a---80072308086.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/18670788431.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///reporazutejitemu.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/34878783160.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_off0000b14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 14976 bytes
SHA-256: f5390d343b5a2b2c90cb4e9310a741cfd58f26ac2f40a4a34a6c0d2c1839a94d
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10924 bytes
SHA-256: e78f1580c14eca6b71000976f634a2ccb23c3c4bf39c8040639c98effe1fc322

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