PDF malware analysis — malicious · c6c8b29b5c21284f

MALICIOUS

PDF

99.1 KB Created: 2021-07-17 09:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d7367bc0c8b09be76a8382624e5010bf SHA-1: b5c8d0ba8198a6227a41f6ee79cf95e694d4b514 SHA-256: c6c8b29b5c21284f9c556528c770574f66ecbf67274f3bb34bb20355f38752dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress upload storage, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9906

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://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/jimagejas.pdf In PDF document text
- https://qualitymattressfactory.com/admin/userfiles/file/53326221453.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a1c60af04514fee9e9e70ba7c7e30274/lilokalujamipibimenuxi.pdfIn PDF document text
- http://cuatudongsaigon.vn/uploads/files/48050829413.pdfIn PDF document text
- https://szaniterplaza.hu/ckfinder/userfiles/files/dunija.pdfIn PDF document text
- https://armandofalconi.net/userfiles/file/43606754428.pdfIn PDF document text
- http://uspeh-kursk.ru/ckfinder/userfiles/files/lugixojemoveligunevegufog.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b463be77f3a---2879998178.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d67b3834---tezimamalokinozabud.pdfIn PDF document text
- https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2f3bd0d118b37b3f2bf3e0618c26aed1/82419222435.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd318ac74d5---8179830618.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/efn86oarvgc0n3enl6kkotghhn/47203334188.pdfIn PDF document text
- http://foto-klub.dk/userfiles/file/55739668689.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9613e639---76189383822.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e6fcdcde8c147869a6c46cfea0aced58/23446320491.pdfIn PDF document text
- https://virtualpulse.eu/UserFiles/file/94379213430.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/5df6b3f2910368d1e5db73c282774625/30298585692.pdfIn PDF document text
- https://venefoil.com/ckfinder/userfiles/files/lasapunitaxivemiforonugug.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d50c21d2443---85580594712.pdfIn PDF document text
- https://fotobolfestmeny.hu/mvc/userfiles/file/mibolib.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c5cc976b8ce443907564a7e9bedbe7ae/1298236968.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a153ff2ed3---bumev.pdfIn PDF document text
- http://robalton.es/Albums/images/file///67169582842.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hadith+of+the+day+in+englishPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0001216a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1216A	25968 bytes
SHA-256: `7d8bd964bc1add01e2c166b56d1173be08d739af2a8c58f10028fc3e63a07aa0`
`font_00_sfnt_off0000f123.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF123	18380 bytes
SHA-256: `9b6f9be77e87a0c7ad1a4a730cafae9f4d173fd1a32e88694777380b9966f2f7`
`font_02_sfnt_off00014ecd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14ECD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000166e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x166E4	10640 bytes
SHA-256: `3b89015c2fdefed67c0a2ec6f9cf390d0d7b3ba127db6ce4cd97f377fc18ffa9`

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