PDF malware analysis — malicious · 8ba28e9cde6e0d10

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 04:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a6e59bc178337136ecaa75c23e27deb4 SHA-1: d548317c87221ac74f39476ec10dfb636a589b39 SHA-256: 8ba28e9cde6e0d100830f30972af5502d8c2222253b11d680bd7b3cce96edeb3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=biozone+air+purifier+pdf PDF link annotation
- http://metisentry.net/ckfinder/userfiles/files/90896043867.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607466daa672c---xojisipulot.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/67f2c2316b66d467fed0ac97055b7654/83275411747.pdfIn PDF document text
- http://elitakhealing.com/ckfinder/userfiles/files/50796608050.pdfIn PDF document text
- https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/1400225924.pdfIn PDF document text
- http://wirheiraten.de/images/file/91027391492.pdfIn PDF document text
- http://sushikyototogo.com/uploads/files/xudegejebuvudaritipapasow.pdfIn PDF document text
- http://xn--80aikni6a0b.xn--p1ai/images/file/64600605218.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b00a5df0f983b84f099a40670bf63776/golibujunikumabavisurid.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/151471786dd3171b33e6618773eaba6e/8413783937.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c573b131981---75975886096.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9fb89cc8---7530240573.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ec2e917bf---40886838509.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9226daadb9---90223712997.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06948bbc38---xunefugutewe.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4261063453---xerewudemefijojewusuw.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddaba13daa---35803778532.pdfIn PDF document text
- https://silga.ca/userfiles/file/safamowipasasegibaxanexu.pdfIn PDF document text
- http://www.psoealora.es/ckfinder/userfiles/files/jopojaxabeku.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/25831142874.pdfIn PDF document text
- http://grimastone.ru/files/69692974998.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ec57dff804b56e7ab9e2c0be48c91d8e/pejenaxijaxomeluvamopin.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/juluzuvofigefus.pdfIn PDF document text
- http://geodez.com/pliki/file/71021272104.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/t8fs1vurjsup7uge8mp836neq2/51479888258.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
- http://rasciindia.com/firetech/ckupload/files/laxufigadatutexup.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_off0000df4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f764.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF764	10392 bytes
SHA-256: `7479f68ec475d001daed40bea1a21ab979707dbac20be9fcd6f544c2d9321cf4`
`font_02_sfnt_off00010ef8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EF8	18128 bytes
SHA-256: `316ee3666b2a81868702ec7a8ad5a18fb7625bd2a85e8466230dfa40af2c797b`

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