PDF malware analysis — malicious · 045b1c0640e32e00

MALICIOUS

PDF

76.3 KB Created: 2021-08-30 03:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 58a0ea82c5b237348404a44a63661a1b SHA-1: 2dd8e646cd75fa5512dc60a933e0c7b56f81a9f1 SHA-256: 045b1c0640e32e00a09189df1ccc65911dde0ec6e54f210b5b01e29c5f088924

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves directing users to external, compromised resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 5

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://medvor.ru/uplcv?utm_term=dominant+biology+definition PDF link annotation
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81db43e5dd---joxuxajit.pdfIn PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/90663297674d8c81ef33aaba967c58d2/kikitusufepezonofo.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/504e1c0ad51567660cdf75b11d1eae5c/19632951532.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21e08b400---1177797417.pdfIn PDF document text
- https://anmoul.com/userfiles/file/sovafetewupibazonem.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/tojinalijokuwogodewodo.pdfIn PDF document text
- http://derkwoo.com/upload/editor/files/30521707783.pdfIn PDF document text
- http://career-id.org/ckfinder/userfiles/files/61430496869.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7700f401dad2426c10fd1c9c5aaa1f9a/kevilapiwomuno.pdfIn PDF document text
- https://kawanmto.net/contents//files/6875585824.pdfIn PDF document text
- http://vina2002.com/uploads/files/bugobemusirofegivodit.pdfIn PDF document text
- https://giorgiosantinelli.it/file/20683599321.pdfIn PDF document text
- http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/74090375808.pdfIn PDF document text
- http://studiophotosfashion.it/userfiles/files/41944434971.pdfIn PDF document text
- http://sam-global.ch/files/file/4128024018.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/zesewujexazap.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fc43b601d07b4a896f00394b114bc7c5/12550505358.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/90815ba368d2a58efdd687da14922521/21575183970.pdfIn PDF document text
- http://etenindex.nl/images/uploads/desetiko.pdfIn PDF document text
- http://hajni.pl/userfiles/file/71084923488.pdfIn PDF document text
- http://pozitron-s.ru/userfiles/file/borikenifug.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcebb144e---ruzapiwukevelobunumekut.pdfIn PDF document text
- http://fusen-es.info/yamituki-n/uploads/files/69455938021.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf9d531a9---mitenulo.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_off0000c595.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC595	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dda7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDA7	17304 bytes
SHA-256: `f147c3374dc56b073c55d6b9bd4ea54b511998fb0208cacbbad610b2ca80a4f4`
`font_02_sfnt_off00010aae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AAE	10684 bytes
SHA-256: `ca5ff0b59b6b8576cc61860e421745f0cce1b97f26bfc69ec3625af72b7c11f6`

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