PDF malware analysis — malicious · b18565b4a7b6f83a

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 19:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: c93d1f5a0fec5f1e770f4cc1bab962ce SHA-1: 7198d2c5ee7b4e4756714575f68fa359db654ed0 SHA-256: b18565b4a7b6f83af289c604deb97d7ec44db53a951d0641344ad6218c7aac45

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 6

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.
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://pistant.ru/uplcv?utm_term=cronicas+del+futuro+dienach+pdf+espa%C3%B1ol PDF link annotation
- http://luxe-pools.fr/i/File/79367164550.pdfIn PDF document text
- https://thebillionbottom.com/business_school/uploads/file/92888055390.pdfIn PDF document text
- https://markmont.eu/editor_uploads/system/files/9775220910.pdfIn PDF document text
- http://prinsart.ro/uploads/files/govigovanekedetip.pdfIn PDF document text
- https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/rofononuvisowixanojeniri.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b9822505---sakanikokivarinufi.pdfIn PDF document text
- http://www.blueoak.fr/image/file/57595726555.pdfIn PDF document text
- http://twgo8.com/uploads/base/files/202108142221329818.pdfIn PDF document text
- http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bfc2507e---vajidaweravo.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613769a279492---25439762551.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae89a3298f---nexojimul.pdfIn PDF document text
- http://gd-weimi.com/upfolder/e/files/20210614211929.pdfIn PDF document text
- http://bandenplaats.nl/cmsimages/file/77911790290.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7337a208---vowadezitizi.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f14253163---97281992613.pdfIn PDF document text
- http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45579862753.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6f6ae92eb41565ac6bb9c18831989e31/wiliwiputuzof.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_off0000e043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE043	11052 bytes
SHA-256: `122a04a0b30880fc25d2bef9857b5b9cc5cdaee48eefc894bd35210a7e2ff678`
`font_01_sfnt_off0000f9b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B0	19504 bytes
SHA-256: `e98ce98ee9469928af16e1bec29266a59468b9387cea4b9ba2ab41c462a537db`
`font_02_sfnt_off00012b68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B68	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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