PDF malware analysis — malicious · 6bba0a7d0302e91b

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 09:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fb7f3a3281453c41df05506e10ed22a3 SHA-1: a5ec668158439bcb562772f123f53572f9398d70 SHA-256: 6bba0a7d0302e91be43b4c5d0e9887cd4adedbdabc39a051be6635b98172935e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, indicating a tactic to distribute or host malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links on disposable hosting further supports a malicious intent. No scripts were extracted, but the structure suggests it's designed to lure users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/318cqgnev6dl5lbhuuktut4ja9/64226621141.pdf In PDF document text
- http://blueyee.com/upload/file/260149521956.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/xataduxibodavoloxomifi.pdfIn PDF document text
- http://kassa.pl/userfiles/file/23290666681.pdfIn PDF document text
- http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/23470089177.pdfIn PDF document text
- https://gulfb2b.com/userfiles/file/12439608469.pdfIn PDF document text
- http://dentalclinicbangalore.com/uploads/36845859177.pdfIn PDF document text
- http://msamerica.net/clients/873634/File/90877519530.pdfIn PDF document text
- http://teplolux72.ru/upload/file/ratadobowoxiri.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2bff37de9bc5350bb8e34d7c5dec568f/bonepigajijofi.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/p4p6g34h95scq3puj6adm0lfac/91897686895.pdfIn PDF document text
- http://kleinschaden.expert/userfiles/file/33770440820.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160737642707b1---gadiwe.pdfIn PDF document text
- https://alate.org/admin/fckeditor/editorfile/21893640651.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9be9c25d9cb8a12a48e7d7c9ab390994/kezuluvel.pdfIn PDF document text
- http://dkyangmei.com/uploadfile/file/2021072808594573499.pdfIn PDF document text
- https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2293cfa30cd0f3c3427e5597d3e779a/jezewel.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c64714531---dorafodupesimibizi.pdfIn PDF document text
- https://venefoil.com/ckfinder/userfiles/files/13947918100.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e9d2099414aeaab7d2ab9c2cac46c69d/51117059989.pdfIn PDF document text
- http://lorofilmes.com/Uploads/ckfinder/userfiles/files/papefaginokibijufakoxirux.pdfIn PDF document text
- http://jcpingie.be/public/files/49719175001.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/31698389346.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/745d1296b0ba4ff683b81cb3791e1d03/dotasep.pdfIn PDF document text
- http://murphysbeads.com/clients/54316/File/rutowob.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=coast+guard+boat+manual+volume+1PDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c014.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC014	10888 bytes
SHA-256: `a62c0cd2404950411197b721f70597a73f32af61d8a2b444359dfb3659008a8b`
`font_01_sfnt_off0000d935.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD935	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f147.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF147	17228 bytes
SHA-256: `af4fb62ff7f41d678eeada554731af74fec247f9b587286c0a8bfda92031962e`

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