PDF malware analysis — malicious · 34d1795301e279f0

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 04:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 13957ca161e95852e3ffa0f0838e5474 SHA-1: 6d05237d6a3cc72463075638e8a6b542d82de444 SHA-256: 34d1795301e279f0914fe792c6bac87611a2d8dc8cebf2c7fa7263b046a28dc1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The structure suggests an attempt to manipulate search engine results or to serve malicious content through a chain of redirects.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://candientushinko.com/images/file/50722393506.pdf In PDF document text
- http://networkinglikepro.com/ckfinder/userfiles/files/52236140459.pdfIn PDF document text
- http://dietmoiquangle.com/webroot/img/files/98012098725.pdfIn PDF document text
- http://clairvoyantinfotech.com/demo/images/73809719662.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160937f562c924---xexusivafexalexilaf.pdfIn PDF document text
- http://sebatmakina.com/files/zawabumopovaropedorug.pdfIn PDF document text
- https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/26266205736.pdfIn PDF document text
- https://fluffy-chins.com/images/file/vimor.pdfIn PDF document text
- http://suachuaspa.com/upload/images-content/files/3284805829.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabe5a1b208---rubesutepiviwonil.pdfIn PDF document text
- https://advantagelic.com/singhania/downloads/file/16720445846.pdfIn PDF document text
- http://kojeneckezbozi.eu/userfiles/file/kikibagusesob.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6988deb31---63218376757.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9u0ekvd7mu2v6a1v71to11kbp5/89889586485.pdfIn PDF document text
- https://bruceautoservice.com/files/file/92348928480.pdfIn PDF document text
- https://lifecareproduct.in/ckfinder/userfiles/files/fowusejejewopikebaxun.pdfIn PDF document text
- http://isotech.si/uporabnik/file/lulesateliter.pdfIn PDF document text
- http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/83312490167.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0c5b27e1ba84e1cb18cbfc26ca556043/nuxonawumalu.pdfIn PDF document text
- http://masonhn.com/d/files/xibuwibib.pdfIn PDF document text
- https://zlato-stribro-investice.com/upload/files/ditidipemijez.pdfIn PDF document text
- http://ivankotov.ru/img/lib/file/27278834563.pdfIn PDF document text
- https://comtraining.cl/userfiles/files/pizura.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/668e185cfb33bcbe9e4618543960f151/lafezubirogegarikejetas.pdfIn PDF document text
- http://alemotta.com/resources/original/file/7135469835.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc659c4a5c---jedebuxewegaxuninuniripis.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quezon+city+zoning+ordinance+pdfPDF 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_off0000c7bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7BC	10916 bytes
SHA-256: `c37c521d51ce41d3c20128a516047f22c5bcb4f4e5fb1c3af570da263cea2ba3`
`font_01_sfnt_off0000e11c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE11C	17328 bytes
SHA-256: `d06d1287d349589949ff2b8d3c8ac30d21db604c9a7103eb3f93ab0ecefe6c56`
`font_02_sfnt_off00010e33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E33	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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