PDF malware analysis — malicious · 9eae6b6a2a2bf030

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 10:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 91fc0d645e453d73afe8f24667452fba SHA-1: 302180e7512e7980d87ec443ad8dbbefafc5a15c SHA-256: 9eae6b6a2a2bf03046cc68845775bfb3c4e170cea20f8c7d4fcfd0dd149a2734

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=android+check+battery+cycles PDF link annotation
- https://learn-atdi.com/uploads/files/kulijofujagakufa.pdfIn PDF document text
- http://robfredo.com/userfiles/file/33180090005.pdfIn PDF document text
- https://www.borzabadi.com/ckfinder/userfiles/files/tapitukomofutaxagab.pdfIn PDF document text
- http://dienvietbac.com/uploads/files/ruligekujawitefumiwovuse.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/mutinikunonu.pdfIn PDF document text
- https://ccskin.com/geektic/files/bisigidamaduzalezuxegifif.pdfIn PDF document text
- https://shevtsov-art.com/uploads/files/retiruz.pdfIn PDF document text
- https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/52318052102.pdfIn PDF document text
- https://ww150002.linebot.net/upfile/files/20210908021025.pdfIn PDF document text
- http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/87419920686.pdfIn PDF document text
- https://khmernative-rice.com/userfiles/file/57750626749.pdfIn PDF document text
- https://copab.tn/216mag.svn/uploads/files/movowagavewikuridazepamu.pdfIn PDF document text
- http://daedukgs.com/admin/fckeditor/data/file/20210908004942.pdfIn PDF document text
- http://nacyc.jp/Upload/file/xizomozotoraxex.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d5ab76e1679f4efef4b0f1af7e0e3d40/kajajofifikabemujo.pdfIn PDF document text
- http://cbcom.fr/ressource/site-image/files/midadesobu.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139053caee7f---14174825541.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/lizisemesozufad.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e22f187e---jigunafarafozirukaf.pdfIn PDF document text
- https://mancomunidadvaldizarbe.com/userfiles/files/zotinumelewamatu.pdfIn PDF document text
- https://bongkartuantakur.com/contents/files/96267344297.pdfIn PDF document text
- https://shiokuda2.com/contents/files/84234083026.pdfIn PDF document text
- https://tidymoney.com/ckfinder/userfiles/files/20741665170.pdfIn PDF document text
- https://seedomoretravel.com/files/files/76703253198.pdfIn PDF document text
- https://anna-bel.com/app/webroot/files/userfiles/files/kulenafubekojulefakon.pdfIn PDF document text
- http://alhambra.kopanramen.com/uploads/files/lonakudanobimoz.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_off0000e0bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0BD	19368 bytes
SHA-256: `544335169190b4a7ef8bca010cdfa9185ac5cc14bdc5b380fadc9207b67afb93`
`font_01_sfnt_off00011398.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11398	10796 bytes
SHA-256: `58872c8c466222592f25c08bded6adc52433c417c8ef762a2c0b3281c9bddb46`
`font_02_sfnt_off00012c6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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