PDF malware analysis — malicious · 96a4b7d212c16e5e

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 06:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 95629147c9266f39beae08b6915f92e9 SHA-1: 4248beafdb059a070b2022fef297f64a1e8233ee SHA-256: 96a4b7d212c16e5ef7868be6a3ba43e738f0c59ca63da979281ff356a9f20cd8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=gta+5+mobile+verification', indicate a lure related to game verification, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

Heuristics 6

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.
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=gta+5+mobile+verification PDF link annotation
- http://sun-tes.ru/files/file/sumumi.pdfIn PDF document text
- http://china-miyaco.com/img/file/20219485241.pdfIn PDF document text
- http://rockhousemethod.com/ckfinder/userfiles/files/popokuwap.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f4c39cfe2---juwalojinekiguvesogofo.pdfIn PDF document text
- https://greenfuturevietnam.com/Upload/files/2997861309.pdfIn PDF document text
- https://korvioinfotech.com/ckfinder/userfiles/files/vowideritubo.pdfIn PDF document text
- http://nadiadsa.org/userfiles/file/89496358853.pdfIn PDF document text
- http://chinajnbt.com/images/upload/File/21451980848.pdfIn PDF document text
- http://sudeoksa.com/userfiles/file/20210905194724.pdfIn PDF document text
- https://netpage.info/userfiles/file/43751693013.pdfIn PDF document text
- https://alaskaproauto.net/nbloom/fckuploads/file/79896160482.pdfIn PDF document text
- http://damosushipleasanthill.com/uploads/files/serowemasiripok.pdfIn PDF document text
- http://easyreturn.store/userfiles/file/fosemenanunokeku.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/25acdfa48bb012a9d742357e4dcc22b4/83844952300.pdfIn PDF document text
- https://elitstroycraft.ru/source/file/xowemijipit.pdfIn PDF document text
- http://miet-boot.ch/images/uploadedimages/file/kugamizirivafaxulu.pdfIn PDF document text
- http://skupka54.ru/upload/m/54590864158.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4decb2b6dd5fa93849dc370042537c9d/womave.pdfIn PDF document text
- http://dh-life.com/ckfinder/userfiles/files/3099098332.pdfIn PDF document text
- https://myphambambi.com/webroot/img/files/6020688469.pdfIn PDF document text
- http://k12kos.com/ckfinder/userfiles/files/84297250793.pdfIn PDF document text
- https://rafautama.com/uploads/file/57572238845.pdfIn PDF document text
- http://tahyuh.com/uploads/files/202109161322471356.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420787862a8---17832322556.pdfIn PDF document text
- http://105chers.netsociality.com/upload/files/dogixulopukatifor.pdfIn PDF document text
- http://karat-dobremiasto.pl/userfiles/file/15218016418.pdfIn PDF document text
- https://areopag.ru/sites/default/files/uploads/80474760563.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_off0000b326.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB326	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cb38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB38	16168 bytes
SHA-256: `dbf07ccd9ae4745cf7dab3ab270d5c8bd44fac0d8feda5e11ab76e4fd24f3718`
`font_02_sfnt_off0000f473.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF473	10708 bytes
SHA-256: `c05e2659701f998ea1bfe24f8c35d7f5fc223724dedcc6ed1f19f9bc3fb60079`

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