PDF malware analysis — malicious · 4d08dc7f2d3524a9

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 06:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4bae073deb7c69a12231aa491307daf5 SHA-1: 44dfb78f433fbdf33a76141373b4225bd2d6de4c SHA-256: 4d08dc7f2d3524a9b6b7bda4ca35e7003cbcba24ecf7df4cc2b529a8a7f185f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://laborke.ru/uplcv?utm_term=phones+under+20000+naira PDF link annotation
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613049b1e972c---67477073745.pdfIn PDF document text
- http://clinicaveterinariagoitese.it/userfiles/files/zelotelimilavuvutaxov.pdfIn PDF document text
- https://asztromiskolc.hu/ckfinder/userfiles/files/fulodow.pdfIn PDF document text
- http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365c9b8886---48021470795.pdfIn PDF document text
- http://lookkorea.net/userfiles/file/17498047580.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/69806621163.pdfIn PDF document text
- http://czechnews.cz/userfiles/files/13363297121.pdfIn PDF document text
- https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/11521161781.pdfIn PDF document text
- https://krossi.ru/images/content/files/4527259163.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/73fe6501527929a43ec25c1c8beaa5e9/90859674016.pdfIn PDF document text
- http://camara.acessoainformacao.org/uploads/ckfinder/files/4220048073.pdfIn PDF document text
- http://ahzycw.com/upload_fck/file/2021-9-1/20210901221754279618.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498ff83864---tedepusudafenewebes.pdfIn PDF document text
- http://compsult.net/userfiles/file/14487641400.pdfIn PDF document text
- https://dorfadvertising.com/ckfinder/userfiles/files/sulozewekemixebatezoferi.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/somazegudakijo.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/014d2642a0af1b37ca425441a00a77db/11325954872.pdfIn PDF document text
- http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/93002187837.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161388b34d6425---liridusisezej.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/pajikewup.pdfIn PDF document text
- http://comitatoamiantovelodromo.org/userfiles/file/61499327288.pdfIn PDF document text
- http://lavalnerina.com/userfiles/file/71765760302.pdfIn PDF document text
- http://proximeo.com/ckfinder/userfiles/files/96010641810.pdfIn PDF document text
- https://ijpdua.com/contents/files/luwiwoju.pdfIn PDF document text
- https://educationindiajournal.org/ckfinder/userfiles/files/32257146739.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_off0000b6bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6BD	15756 bytes
SHA-256: `098c62d9446fa607ffe6c7e56bce52b984fbb259f4a4e2313f1f2c7ab37974af`
`font_01_sfnt_off0000decf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDECF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f6e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6E6	10544 bytes
SHA-256: `779b9a74b55acf9f6a693168d23b6c14bf0f51a28906ac812b2d79b72a18212a`

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