PDF malware analysis — malicious · 3f4fce9f3dbad5b9

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 17:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 64d0d66de4a4380bd38ca6fd17ad83dc SHA-1: e6f0f8565322dad159e541a466144898942a46b2 SHA-256: 3f4fce9f3dbad5b92a066f9ad149b409cc31fb5879db4254d12ce58a2a14ae93

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=myers+briggs+career+test+pdf PDF link annotation
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7bd3ca83---kujulega.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/9729816722.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb85054e616f21bb81b99ce4bac61b3d/64066791797.pdfIn PDF document text
- https://tckontrola.hr/files/pebamaxanavij.pdfIn PDF document text
- http://cnkls.com/userfiles/file/1628536474.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/km1pkb6er4s4l595e7dp8f9lk5/12325452911.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cae901a8e---sebosapepajamulepigi.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e8c3ed28---raguxatuwaranaxof.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094e35a0b9e0---68027291295.pdfIn PDF document text
- http://rilta.net/userfiles/files/gowebeferaj.pdfIn PDF document text
- http://prospekt-rostov.ru/ckfinder/userfiles/files/derizukuvipinijopobalub.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/wipotisaxuxogalimesuvot.pdfIn PDF document text
- http://sambometal.com/dataroom/file/jigedagotutetesaso.pdfIn PDF document text
- https://svetplus.com/userfiles/files/xobewojetukizunagadixemew.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/pojimupadapu.pdfIn PDF document text
- http://archi-m.ru/userfiles/file/64659899288.pdfIn PDF document text
- https://sfilatinogourmet.it/file/feledode.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/573ce77e1be3e8574a2352761dc5d72a/95925444506.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/tobijabozolil.pdfIn PDF document text
- http://promocode.lu/userfiles/files/48182551057.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348cd3ecf20---kogelumasiken.pdfIn PDF document text
- https://0924055971.com/uploads//files/202108060208066221.pdfIn PDF document text
- https://kisikana.hr/userfiles/file/11348643766.pdfIn PDF document text
- http://scottsdalehighbeavers1978.com/clients/80197/File/timudi.pdfIn PDF document text
- http://skisun.it/userfiles/files/puxisuduv.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_off0000e621.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE621	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE33	18500 bytes
SHA-256: `37fc77c907f875cdd52c23b41b8deb092a9f5a3028b1b19df4eacdf10026e59a`
`font_02_sfnt_off00012de6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DE6	10772 bytes
SHA-256: `bf96ff3f93617d86e816e2cd179039c8db9be766ddcb1d46eac9738c8dbd8a1d`

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