PDF malware analysis — malicious · 3ca85f07c78035ca

MALICIOUS

PDF

83.0 KB Created: 2021-07-03 14:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 22603984e74d0f36bd6a19046dc0718d SHA-1: 109a529f7b056c8b468f6d2d86bf23648e2fbd2f SHA-256: 3ca85f07c78035ca2c31de70fdc6b0bc2d36aa8223e42453718e70b02a6c02fb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the presence of numerous external URIs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=55+mil+to+inches PDF link annotation
- https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/92073d3f06b82812ad05d092b62d1e2f/21659445753.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1e2914c9---23723834697.pdfIn PDF document text
- https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/df0c43dd5760050696cff8482675af18/34360375432.pdfIn PDF document text
- https://hondamienbac.vn/userfiles/file/39030596879.pdfIn PDF document text
- http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/fenigubinilamededigo.pdfIn PDF document text
- http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/6e05c9113f55269690f9731200741e8b/97156161794.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8bd6046f2b400221a7486d46f1752546/75133469884.pdfIn PDF document text
- http://nessium.net/userfiles/file/1734444285.pdfIn PDF document text
- http://all-pass.com/folder/editor/file/46775807039.pdfIn PDF document text
- https://roweryelectra.eu/app/webroot/uploads/file/16199757899824.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95becf7a0---10775670966.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/citshuigp2ual4qg4b1hb9lv65/58812741086.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c4107eb7babacfaab7665547f7325291/47999199691.pdfIn PDF document text
- http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/5983216603.pdfIn PDF document text
- https://almuhja.ps/ckfinder/userfiles/files/tonipovesudazelasavot.pdfIn PDF document text
- http://tvoirostov.ru/ckfinder/userfiles/files/murotixu.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e4b65802c---50878057509.pdfIn PDF document text
- http://aaaexpressac.com/userfiles/file/pofaredetalomud.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba2e63abf---digozedumivefiwajo.pdfIn PDF document text
- https://strechybenesov.cz/content/4898868927.pdfIn PDF document text
- https://daismene.it/file/17288628914.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/datevekuwezoguju.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/1c2e7c3773702eeb4bcb1d5f0a5fe6d4/butatopokitex.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c739a1b3f7c---gosolukamakulagotu.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a463e75bf---janobagem.pdfIn PDF document text
- https://bdaudit.ro/userfiles/file/mikerukize.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_off0000e324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE324	10268 bytes
SHA-256: `39f1af0b3823a71fc2ea920abf6766350e67b0b7957c0295e1ceabf9cda7120e`
`font_01_sfnt_off0000fa02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA02	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011214.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11214	17136 bytes
SHA-256: `78b98904373aacfcff03ea51f64d0aa5e030cd961d45d350269345632ee067b4`

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