PDF malware analysis — malicious · a10f3d39e9727cea

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 02:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d6b6be3ca736ace8e1e1809b0bdf6ce6 SHA-1: 4bd0f6f4ea653f4735d9c3848a9d02e91465aae7 SHA-256: a10f3d39e9727cead5cd5cd7b8fda87e4db4eb24acd74a36c6aa2ac363426873

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to lure victims.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=simple+past+is PDF link annotation
- http://zlato-stribro-investice.com/upload/files/tuzubilugukaxuzobitotinek.pdfIn PDF document text
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c5daca7fdcf---gegedobinebedoliwulelu.pdfIn PDF document text
- http://ehs1958.org/clients/73155/File/wonafonomivomi.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/27081652a7d8e51a26b349136f405d5d/48256494560.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34637274d---kepesawowuzusalisufow.pdfIn PDF document text
- https://uniontend.com/userfiles/files/73942008361.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07f93672b---jolemo.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nok5lampgmmkq7gk5sqog9gj1n/nusojafan.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb039a2bbc3---gutazenax.pdfIn PDF document text
- https://kis-u.com/page_data/file/20210530122444.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c9f08e52ef0b0affb3bc75fa778e9b8b/94473336499.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160897b46dd44f---55232082913.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2396a828---6387589387.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e25c0074b---xadovenevumelejavu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b337018dd---7335133848.pdfIn PDF document text
- http://mcutech.net/files/1227388411.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/d9evplkn8dlvgancbp2jo7mi47/lijixuvitezajufofow.pdfIn PDF document text
- https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/4ae4fd587d894baf3ace3b4941f59616/lebofefed.pdfIn PDF document text
- https://genegurumiraclehealer.comuserfiles/file/rulikefagufafupadotetepaj.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4c6ac067---sijori.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16081d006592b6---95211426979.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b26d6109---18050719126.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba89c55d4---2711446964.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5797c2c7de14d8dc7c110ef0696aa7f7/sadudawafusebuxobebebax.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_off0000e7ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AC	10164 bytes
SHA-256: `d9396bb7b0516f6dee59bf52e64ef8306d9a7302a05e6f21b82f7e4dbaa77768`
`font_01_sfnt_off0000fe63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE63	16928 bytes
SHA-256: `83dcc98dad26be0a8eaadfbee1a5c8371a21ef3761ddaf899f992a486b1d7828`
`font_02_sfnt_off00012a70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A70	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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