PDF malware analysis — malicious · bcad8cafbe6cbadc

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 10:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 73e5eeb7377778b832c9e2ef4e991b19 SHA-1: 356c4fa99628b97b64f5e73576546ec15f9c6e0e SHA-256: bcad8cafbe6cbadc2e27c4c2a2385a56bd214c7eda0cd59e7ef27c098c775513

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting it is used as a link farm to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is part of a campaign to distribute phishing or malware via compromised web infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://drafthe.ru/uplcv?utm_term=indications+for+renal+biopsy+pdf PDF link annotation
- http://wagnerpc.com/userfiles/files/kafojudedidubogobusevujam.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd0adb336---76022026392.pdfIn PDF document text
- https://coimbatorepressclub.com/FCKeditor/userfiles/file/tagabazijunufividezorutu.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/98a8da69433ac7f12ea2da6ccf0aecd4/degogiragikunidumedevaja.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81da531ea---fumutoragav.pdfIn PDF document text
- http://brixtontaxi.com/survey/userfiles/files/87179146391.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/97556592c47b8f35cd04c7cbafb5fe29/19918432953.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160883441cba49---35511170498.pdfIn PDF document text
- http://e-baze.lv/images/site/file/22126765218.pdfIn PDF document text
- https://faktxeber.com/resimler/files/buguwuluduxikozetija.pdfIn PDF document text
- http://vp-dmsh.ru/admin/ckfinder/userfiles/files/zokaredez.pdfIn PDF document text
- http://bubb.cn/up_file/file/pupuvubenigifikajeguwi.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c8190220995f4ee4ac0ca4ceda1ddc04/rilimirodabozuvabike.pdfIn PDF document text
- https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/heift1f0om0uvg6jq2lb4k044a/43113925781.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087daa746492---61429813921.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/jomufukitexibojaj.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/007c13d32f3209f682315451594e3cfb/busakapiwej.pdfIn PDF document text
- http://hotstamping.pl/files/file/manetoximemilinunobilux.pdfIn PDF document text
- https://theptaynam.vn/upload/files/99099406622.pdfIn PDF document text
- http://phuquytravel.com/nguyenvanlinh/files/47686894545.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c28bc7a510---kufamojanuravozam.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9032b9657331a35d0ebacc4b19e73bb0/72924931302.pdfIn PDF document text
- http://mrukseo.pl/userfiles/file/lubiwarigevibujiwo.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b3e0ca0c315d737ac06b616612e2e42d/84705567412.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/949669a781126a0c834f7593308c462a/jovugonubonefijowazov.pdfIn PDF document text
- http://urbancollab.com/userfiles/Proj_Name//files/vajuto.pdfIn PDF document text
- http://lamachine.nl/userfiles/file/nozozozudef.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_off0000df58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF58	16920 bytes
SHA-256: `39deedd500d2887d383cb2ffbeb09aea90cc41b674914c8d98efc4966806b1d3`
`font_01_sfnt_off00010acd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ACD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122E4	10820 bytes
SHA-256: `2ebac75687f64143085acfc4d73185b89814e4bd79e728abb74ef029c9bcf3e3`

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