PDF malware analysis — malicious · 6bb9c09b68462683

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 12:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7ab7181b054c52b451ba7bb2dbf7b630 SHA-1: ef1c4c47af2c50bfd3ee9fd8c239bc8b60246d22 SHA-256: 6bb9c09b6846268397b0040fc77d2227d8008ae782acff1aa21a7ed19fe259f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

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://crewmak.ru/uplcv?utm_term=holandric+inheritance+pdf PDF link annotation
- http://chaitraglaze.com/uploads/73433554449.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/914b1c7b6a9c2d361b5f93f7477828c7/17522288051.pdfIn PDF document text
- http://phutungquanghieu.com/app/webroot/files/ckfinder/files/ruzovesokujumuv.pdfIn PDF document text
- http://www.guus.edu.mn/ckfinder/userfiles/files/80228521131.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ne7agpemqom5mdhplfoo6uungh/69962713442.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605c4ca255---jefafupagosusakulitima.pdfIn PDF document text
- http://yossy.biz/userfiles/file/miforowulelodojujada.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7477030c5---wiserazudozuzilimala.pdfIn PDF document text
- https://giasidaily.com/uploads/userfiles/file/budodi.pdfIn PDF document text
- http://yuhenganquan.com/userfiles/file/20210814062419_1953669519.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b2a15a1eabefb6dacefbbfcf7f1d2f0/75648938278.pdfIn PDF document text
- http://imhkayseri.com/resimler/files/topisonimujajomediw.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/10860924383.pdfIn PDF document text
- http://gdlianyu.com/uploadfiles/file/dewixoxijutufosufiguz.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160939f74784a8---felojurejaw.pdfIn PDF document text
- http://gamebonda.com/ckupload/files/getumitubaxuxas.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/de4b9c292f57a07ef992d331f86233bf/mutosuzobafukozosojuru.pdfIn PDF document text
- http://jrecchina.com/ckeditor/ckfinder/userfiles/files/75841534806.pdfIn PDF document text
- http://banglenhospital.com/UserFiles/File/zanejifofabog.pdfIn PDF document text
- http://thaimassagemodel.com/ckfinder/userfiles/files/32836854647.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fvo0dpbgjqbjm0ejq2km0t3ub2/79196572827.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/35500706806.pdfIn PDF document text
- http://stalmont.eu/userfiles/file/42724617610.pdfIn PDF document text
- https://associazionemusicaviva.it/uploads/file/16396376617.pdfIn PDF document text
- http://babywagen24.de/userfiles/file/vexebekuforetav.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_off0000c621.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC621	10540 bytes
SHA-256: `5f4947c9df914a999f71d0bec6c3c831085973c9aa842526a3cb6e41dc81616b`
`font_01_sfnt_off0000de00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE00	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f612.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF612	17344 bytes
SHA-256: `ce6c608a00a5655c2cd328988ec249d6b6f39fac0e46a60fb3b0da1cb7cc55b6`

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