PDF malware analysis — malicious · 261ada9a6e0e3dcd

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 16:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f95eabc85bd04d6503966f28a15d621a SHA-1: 7a26be9cb3b44875bd20fb594e39a074125bccec SHA-256: 261ada9a6e0e3dcd64dc4a3ed013d454abd9228191d23ba4a03c9725a1081e42

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. Heuristics indicate these links are used for SEO purposes and leverage disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users through deceptive content to click on these links, potentially leading to further malicious downloads or phishing attempts.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://roland-toys.eu/userfiles/file/85484115187.pdf In PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320ff9b5b95---93480186567.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/zerugemeton.pdfIn PDF document text
- http://veiligheidssloten.nl/ckfinder/userfiles/files/fusasoziwe.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ca72f985---sojorim.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2caab83231dcf7195704382ff88d27b9/7773846850.pdfIn PDF document text
- http://arqing.es/ckfinder/userfiles/files/55589861677.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5a75c593---17076086843.pdfIn PDF document text
- http://studiocinti.eu/userfiles/files/87144378523.pdfIn PDF document text
- https://samirkumarpaul.com/ckfinder/userfiles/files/kikapajexaxewir.pdfIn PDF document text
- http://jfhcoaching.com/userfiles/files/87890978880.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6cc288de7---77967753352.pdfIn PDF document text
- http://loscogliodifavignana.it/userfiles/files/86776702794.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161380221ef6be---vixutoga.pdfIn PDF document text
- http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/lonalojuvotigibe.pdfIn PDF document text
- https://noursportevents.com/wheelmarine/userfiles/file/14980696792.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/95840143924.pdfIn PDF document text
- http://www.heksan.com.pl/file/54117119014.pdfIn PDF document text
- http://hitechdentalhouston.com/uploads/files/soboledezojazopozazo.pdfIn PDF document text
- https://nurea.se/currency/userfiles/file/31640446805.pdfIn PDF document text
- http://www.hgbehringer.de/img/files/files/95442364586.pdfIn PDF document text
- https://bloc-immo.com/images/laduzi.pdfIn PDF document text
- http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38997944044.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qsmfcf1kj40d3enognbr4g5hvu/kivanupam.pdfIn PDF document text
- http://hacsbathtarntaran.org/~/userfiles/file/34085621250.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/bb3566cad64ea54e609ea75a8e3ea789/jewuzon.pdfIn PDF document text
- https://qualityroofinnandsuites.com/nbloom/fckuploads/file/97019112360.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613928d7426a5---65560719111.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+recover+permanently+deleted+photos+from+android+phonePDF 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_off0000d8e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8E4	11140 bytes
SHA-256: `280c69f8d3debcf665f019cf8f53b04e319be4277518a1708054d562775b3c54`
`font_01_sfnt_off0000f2bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2BD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010acf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ACF	17324 bytes
SHA-256: `209a01aa884b98244c08e9c862cb77259e48448b0793463e40e273038cc7a6fc`

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