PDF malware analysis — malicious · 3926425d211aa2f0

MALICIOUS

PDF

80.9 KB Created: 2021-10-24 00:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 5e482834b51a036107fdf764395477b2 SHA-1: 1ac2ed009c401ffd498c420f51fadbdd08c4f909 SHA-256: 3926425d211aa2f0fd9c8fd60f301a495901a9abd855712cbdd1e3df0f1fcd1c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of embedded JavaScript and a large number of external URIs, many pointing to compromised or disposable hosting, suggests it is designed to redirect users to malicious sites. The primary function appears to be acting as a link farm for distributing further malicious content or phishing attempts.

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://krisoc.ru/uplcv?utm_term=iit+jee+questions+on+thermodynamics+physics+pdf PDF link annotation
- https://noelex22.org/userfiles/file/55841228753.pdfIn PDF document text
- http://osmed.cz/app/webroot/files/files/5388311785.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161572b05de089---8908878831.pdfIn PDF document text
- http://dytac.hk/userfiles/40431117356.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/13d3f365ea29447f9e506d282e7ac6a5/xanope.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b02ad975fd---7342857669.pdfIn PDF document text
- http://vektor28.ru/userfiles/file/fawasasijepikob.pdfIn PDF document text
- https://asiastudy.in/ckfinder/userfiles/files/xevoludakumikuzuj.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616eb8b11acbb---lejowupakakidowopifilu.pdfIn PDF document text
- http://eastcity.hu/ufiles/file/89727273358.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16155ccf57f117---vuwunu.pdfIn PDF document text
- https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614da19964514---66700443485.pdfIn PDF document text
- http://jtipartner.com/ckfinder/userfiles/files/50781021510.pdfIn PDF document text
- http://seidels-mineralienwelt.de/images/uploaded/file/38009447538.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/973234be4d56fe0a5240d5783353e28b/64540399636.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/24596998302.pdfIn PDF document text
- http://geofer.eu/userfiles/files/turiwovusibenivotitazas.pdfIn PDF document text
- http://www.scsk12.org/policy/files/files/vidomuwowofi.pdfIn PDF document text
- http://siamsankyo.com/Uploads/file/wuxobetilanitejolijatose.pdfIn PDF document text
- http://lokalsport.no/userfiles/file/89922222358.pdfIn PDF document text
- http://xyr59.com/filespath/files/20210913170358.pdfIn PDF document text
- http://bjsixiang.com/jingkelun/userfiles/files/20211021120902.pdfIn PDF document text
- http://tomei4x4.jp/js/upload/files/buramufugumejamelanovufu.pdfIn PDF document text
- https://fengshan-zhennangong.org/upload/ckfinder/files/zilajufawejoduge.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_off0000d5ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5FF	17400 bytes
SHA-256: `a5a5872b7285dff1849f39a8b4ee40ea78211199284e8053fb72f3e1d905ecac`
`font_01_sfnt_off00010341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10341	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B58	11280 bytes
SHA-256: `92939e560d9dd90e50c3888003280ebd68c056d2c80884c4d30a8c9e158ffc5e`

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