PDF malware analysis — malicious · de98c6d4211e3b73

MALICIOUS

PDF

75.9 KB Created: 2021-10-05 21:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e0c4d815c1aea199ab19f8addf73f633 SHA-1: 0c08283b3801a494d26829742105acda81a526b8 SHA-256: de98c6d4211e3b73ef983f447b3c3a2eb6b77624811398c6150b7624d9f244c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=pdf+to+html+source+code PDF link annotation
- http://enjoyisagenix.com/ckfinder/userfiles/files/8278633895.pdfIn PDF document text
- https://salvatoredivilio.it/userfiles/file/32783116100.pdfIn PDF document text
- https://haisanquangninh.org/data/dulieu/files/dozafepexirelelo.pdfIn PDF document text
- http://macautemple.com/userfiles/file/dixepemisudibakozufivumef.pdfIn PDF document text
- http://i-akparat.kz/ckfinder/userfiles/files/fofopelasonejek.pdfIn PDF document text
- https://eagleegg5k.com/ckfinder/triplebuserfiles/file/domagijaxarisunebijugebex.pdfIn PDF document text
- http://phanmemerp.vn/attachment/files/74966018114.pdfIn PDF document text
- http://ipceurope.com/assets/file/18329999550.pdfIn PDF document text
- https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/33347612486.pdfIn PDF document text
- http://quaint-house.com/images/blog/file/17229806811.pdfIn PDF document text
- http://invismortgagebroker.com/images/file/68421949496.pdfIn PDF document text
- http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelukowigalukeja.pdfIn PDF document text
- http://www.pzkexie.com/up_files/file/bawepevelukolo.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdf0905e5b---dijikekefo.pdfIn PDF document text
- http://lammensfilip.be/uploads/files/28696576349.pdfIn PDF document text
- https://dnm.tw/uploads/files/202109282356066614.pdfIn PDF document text
- https://bhandarisurgical.com/ckfinder/userfiles/files/nivamufikimetobe.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0v3sfkvo59ob2288mae67pr65/dawerefadugige.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f68178d6---pedugawaxijokuwemilorizu.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/53dea329f45fe7525141a6542e2b3648/86397215686.pdfIn PDF document text
- http://on-video.com/movies/movie_data/file/19304346715.pdfIn PDF document text
- http://kadh.kr/bobod/upload/file/mamoki.pdfIn PDF document text
- http://marcth.pl/media/fck/file/wisobeduxuraw.pdfIn PDF document text
- https://bdblue.com/ckfinder/userfiles/files/zuzuterogitifolotidekimo.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_off0000c3d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dbeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBEB	10484 bytes
SHA-256: `f8340119ec73faf8e82153d2e362581369607a3033834a4a600a49231f0fb829`
`font_02_sfnt_off0000f3c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3C8	17828 bytes
SHA-256: `89820cc989519c4df63bb9eda756f31fb7922ac8d8c928b5aebf99c634c462eb`

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