PDF malware analysis — malicious · f298cf3d3678926b

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 19:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 72230779a3a664f11b0c3c81ac4e0bc7 SHA-1: 3684fccd2b9ff18c6ddef14831a46a35d5cb0986 SHA-256: f298cf3d3678926b48be7a56d4bea3606b7441995788890bc2580baea9e4f34a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains embedded JavaScript and a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9959

Heuristics 7

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.
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://ketchas.ru/uplcv?utm_term=ldplayer+android+11 PDF link annotation
- http://sochi-riba.ru/ckfinder/userfiles/files/64139137353.pdfIn PDF document text
- http://hotspot-usa.com/js/upload/files/mabelidofalijevug.pdfIn PDF document text
- http://johnmarzillier.com/ckfinder/userfiles/files/tekoxijitewadupopasad.pdfIn PDF document text
- https://wheelmartthailand.com/image/upload/File/61488190139.pdfIn PDF document text
- http://showdoimovel.com/files/files/12193031521.pdfIn PDF document text
- http://sake-tori.com/images/library/File/dusujoxokixuk.pdfIn PDF document text
- https://dichvuketoanvn.org/uploads/files/24266351658.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613030ef8c827---23234146974.pdfIn PDF document text
- http://flynewsletter.com/uploads/file/31071050900.pdfIn PDF document text
- http://fc-junajted.com/upload/datoteke/jatuwomivuw.pdfIn PDF document text
- http://volkshilfe-vlbg.at/images/content/files/4749522847.pdfIn PDF document text
- https://shriayurvednagpur.org/public/ckfinder/userfiles/files/45309595989.pdfIn PDF document text
- https://indobaliart.com/sitefiles/file/4250537299.pdfIn PDF document text
- https://bevasilicones.in/userfiles/file/60098745584.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142491194951---tisili.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d697172c---bobeguzawijebonur.pdfIn PDF document text
- http://seattlebestteriyaki.com/uploads/files/54563168489.pdfIn PDF document text
- https://barcelonacentremedic.cat/files/galeria/files/93963267858.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dc0b0fc4---86091090391.pdfIn PDF document text
- https://koparieshorvathbusz.hu/files/file/xanazubitofipunuv.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/42d8046d56ee33acc65dd72266a472f7/mivabuwazijidage.pdfIn PDF document text
- http://coral-travel66.ru/admin/ckfinder/userfiles/files/sorufixutezup.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8d020a90---87956439278.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_off0000ae4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE4F	10244 bytes
SHA-256: `a3f0a51c1a8364ae87222871ef912cdfd5a0f1ed76ef5fbb3411ca10241b01e4`
`font_01_sfnt_off0000c567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC567	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000dd79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD79	15204 bytes
SHA-256: `10fdc13f2526762742b5ae2b11ff31ef3f14b21e2b839707de7f128e0922426f`

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