PDF malware analysis — malicious · da3cb7cbd98bd825

MALICIOUS

PDF

82.1 KB Created: 2021-10-11 12:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: bb782ac89070c52b21e70736cf4c24c2 SHA-1: 334b0de0d04fae45137372ffbcf556fe072a9e0f SHA-256: da3cb7cbd98bd8259ec014cb76ee030e39966695491951150097ca1c4b003fd9

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple links to external sites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download pages. The embedded JavaScript is a common method for exploiting PDF vulnerabilities to initiate these redirects.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed40c3111b---sumepojaxoposomilolami.pdf In PDF document text
- http://dedanskecasinoer.dk/userfiles/file/9446413584.pdfIn PDF document text
- http://boldogelet.hu/media/foroluramuzuravagigufezat.pdfIn PDF document text
- http://zxpgw.com/userfiles/file/zorowusunobadivobi.pdfIn PDF document text
- http://sydjpg.com/images/upload/file/20210905_073702_180.pdfIn PDF document text
- http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xodosobegega.pdfIn PDF document text
- http://bancasemecanino.com/userfiles/files/ratifexenegu.pdfIn PDF document text
- http://mertcelikkapi.com/userfiles/file/gegujobuxasufewe.pdfIn PDF document text
- http://crystaltrade.hu/data/file/21370630642.pdfIn PDF document text
- https://noble-program.site/js/ckfinder/userfiles/files/pelarafutivew.pdfIn PDF document text
- http://siamsnail.com/media/userfiles/files/73052210744.pdfIn PDF document text
- http://agro-pasz.pl/ckfinder/userfiles/files/53207855865.pdfIn PDF document text
- https://alohasafaris.com/files/xesowigebirudepenelunelor.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
- https://uzunlarpeynir.com/dursun/upload/files/69871734698.pdfIn PDF document text
- http://xaydungphongphu.com/uploads/files/vawidoxojevedap.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16162feea811e8---dosixuduwujidebababup.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081198e887---54517609366.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t4fet3uu5n5nf50ept95rjlgg0/97917446613.pdfIn PDF document text
- https://ww150006.linebot.net/upfile/files/20210918220206.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a05ce6d46339fbebe44408139d8499e/12147312215.pdfIn PDF document text
- http://cgl.lu/userfiles/files/buzokunimifeseme.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t9j4o84m4uq5vjt93s6cjhabm2/67790387852.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156dd5701747---penoto.pdfIn PDF document text
- http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=dr+wong+oncologistPDF 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_off0000d777.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD777	20140 bytes
SHA-256: `963a747b7a4d91d6c8ada316ca22f7e485e83094797bfa18fa7fe73849f56ccd`
`font_01_sfnt_off00010b93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B93	10196 bytes
SHA-256: `d7f2f49b0a873d93c693a14ef7ea57bdc1e42bc3d0e656276e76b7290043a4d9`
`font_02_sfnt_off00012294.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12294	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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