PDF malware analysis — malicious · 41a3d0532b6b08ad

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5df5bbdbb7655d8a54a2e326e9872b10 SHA-1: 7262724ce8c5f4f68c80720d6f83dda2b8d16cc7 SHA-256: 41a3d0532b6b08ad26a3f41035c212ebfa756fcc40ab386230c1f0d28e8850cf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of these links indicates an attempt to lure users to potentially harmful sites, aligning with phishing or malware delivery tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://gtlitalia.com/userfiles/files/kokag.pdf In PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2637069c78---17819264851.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/38v14s824ffv5rh7avddlqsptu/38605235838.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85e9897e5---lodowizoxememevil.pdfIn PDF document text
- http://dlshixiang.com.cn/ckfinder/userfiles/files/35009719975.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4b075d79fae5ed2b51a9f331d698bb91/33396516834.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607825232c3db---1623333848.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612756f7c6e9d---16850720547.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116051422e06---26572894000.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbddfa2c74c---vatufututonawuvewadinonid.pdfIn PDF document text
- https://dolphinsolutions.net/ckfinder/userfiles/files/puguvak.pdfIn PDF document text
- https://www.larche-de-jules.fr/ckfinder/userfiles/files/tefifo.pdfIn PDF document text
- http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/moforipufotipidife.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/noxisusinizisepemexiv.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bf2b4cfc8---tinufogoxawubafo.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f27a6212---megoxaxuw.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8edc204c93b669986850c69e866b5526/rufodufula.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/ninixepaturujus.pdfIn PDF document text
- https://sibconsulting.com/contents//files/38527689744.pdfIn PDF document text
- http://liburnia.pl/userfiles/file/86185300158.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/aeeef2dccaab013ac7a8b148021228b8/55952764622.pdfIn PDF document text
- https://sabagdasarov.ru/upload/file/lesamejinatasogufimelage.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/qf4jja0tpi2bcabld2no73s460/vuzot.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/520ad7ad9ba64975def87e4655740f9a/kixenotele.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8e074a3f02ec6f94efb1ed13d573be7a/meduduzegeporedorur.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ad54294ba---9098484780.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=urea+elevada+causas+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_off0000c866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC866	17924 bytes
SHA-256: `60665a3bd8e825a57c1647acd5d9eb0d25ef1be038fe0c956f4e77b0371aefc5`
`font_01_sfnt_off0000f52b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF52B	10372 bytes
SHA-256: `b9f7f0056ceae7d3ee60ef26adf76d4323ec26e4810129a91c3f60e625d97086`
`font_02_sfnt_off00010cba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CBA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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