PDF malware analysis — malicious · 8738981dfd82a7b3

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 15:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 79e0da3fe3b426ff55e1ceb084a20ac3 SHA-1: b72e60513a7dde20d0caef42c909116a7eab3421 SHA-256: 8738981dfd82a7b34de0086ae64ce2dae7ec90f9f40f09880f94f07d4e348390

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of directing users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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 https://pistant.ru/uplcv?utm_term=exercice+corrig%C3%A9+entrepreneuriat+pdf PDF link annotation
- http://yildizteknikelektrik.net/resimler/files/89694868964.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/20635248521.pdfIn PDF document text
- https://bustotoronto.com/userfiles/file/xalewituzosoju.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/u5o8obkp86t9m4b6oft80mhvr9/33177503786.pdfIn PDF document text
- http://enslev-anlaegsservice.dk/userfiles/file/webekiwijamexubatorolewew.pdfIn PDF document text
- http://lpc2529.com/piceditor/file/12830380927.pdfIn PDF document text
- http://mextro.de/upload/files/joxizirug.pdfIn PDF document text
- https://laser123.com/geektic/files/padawuladep.pdfIn PDF document text
- http://box8websites.com/ckfinder/userfiles/files/dofuxufe.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/132f8c3b83297284637c4186b091b86b/58146795814.pdfIn PDF document text
- http://mabo-meccanica.eu/userfiles/files/jixuju.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34c073513---87494514421.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e8047568d---91751857404.pdfIn PDF document text
- http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/67444013424.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u5v6b2vjbjqfvo2ea0nbve4j3r/801939338.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/59a0b80007b3609752e855ece8bb38ac/8091653872.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/telagomoxijukakelamaxiw.pdfIn PDF document text
- http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/povabijabenibufavap.pdfIn PDF document text
- https://tecnibat.net/uploads/archivos/43978891337.pdfIn PDF document text
- https://bem-sa.com/img/file/rokobakufilitozojezil.pdfIn PDF document text
- https://pastelbuilders.com/userfiles/file/wuzazadijapimakufenupegu.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7638edad19142bdbe61f399f658f3308/42081546235.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117750a037---17874019520.pdfIn PDF document text
- http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160af89767c9f2---38368362293.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE51	23760 bytes
SHA-256: `06f29331217d4e001ffe31fc7f8a670f8c7d0645dd722554cb7319d40d216eea`
`font_01_sfnt_off00012a9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A9B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000142b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142B2	10920 bytes
SHA-256: `0c19025f4cd54f04f93581cbdeb32fbbe3139298106fd7b1f48fc035b2f00f8a`

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