PDF malware analysis — malicious · 6e8956b881525820

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 03:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 3eca487dcda9ea763dd0e8d2d9b643b3 SHA-1: 1a9562dbd2703dfa7ac5a69c7096c44e290c77d2 SHA-256: 6e8956b881525820a637a9fc95db498562bc6f036dfdba330142de52cd83990f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing or malware, leveraging compromised websites to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7b260c95b4af976ca13c39a806063731/29421402067.pdf In PDF document text
- http://uni-farm.pl/ckfinder/userfiles/files/12900286317.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130050bca533---43286691486.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e576c04a5---kotaxikamonetixelab.pdfIn PDF document text
- http://letnipohar.cz/upload/file/67122642673.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1feb2f8fd991a7e6ba7987cae64a96e1/78621409497.pdfIn PDF document text
- http://www.anaja-inter.org/public/file/92256334937.pdfIn PDF document text
- http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/9187703005.pdfIn PDF document text
- http://i-akparat.kz/ckfinder/userfiles/files/wagaluj.pdfIn PDF document text
- http://ckrestaurantgroup.com/ckfinder/userfiles/files/luxezezasoju.pdfIn PDF document text
- http://jewelry-shopping-city.com/uploads/files/202109110011533404.pdfIn PDF document text
- http://orthodoxvaidikasanghom.org/userfiles/file/dekugufolobudedodu.pdfIn PDF document text
- https://ginniglobal.com/uploads/file/71712218057.pdfIn PDF document text
- http://tlumacz-bialystok.pl/pliki/file/jivafuxiwivamujeve.pdfIn PDF document text
- http://istihdamhaberleri.com/upload/ckfinder/files/1121399369.pdfIn PDF document text
- http://simkoongschool.com/uploads/editer/files/1503468647.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fb591c9df5fa00bce655fadfe14f38be/gokazovudo.pdfIn PDF document text
- http://cuboni.com/uploadfile/hong202109102306182551.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd2059ace---52158280876.pdfIn PDF document text
- http://parzenica-bialka.pl/userfiles/files/54758420644.pdfIn PDF document text
- http://clinical-pain.com/pds/userfiles/files/29009041077.pdfIn PDF document text
- http://grupposcorcia.it/userfiles/files/90340527920.pdfIn PDF document text
- https://forumhrdbekasi.com/webroot/userfiles/files/wozarulolada.pdfIn PDF document text
- http://originalbau.hu/imagesfiles/nobotupu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+whatsapp+para+samsung+galaxy+pocketPDF 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_off0000e89e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE89E	11224 bytes
SHA-256: `e9df7f92d6c9cb4e05fed015eaa433ad6eb4e2cf29dc2fa3083d5e5e31714759`
`font_01_sfnt_off000102ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102EC	17696 bytes
SHA-256: `28ebf371f56c9a72f692942f4151ee0e9667705e7c6f44f217f9edcd333970b4`
`font_02_sfnt_off000130f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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