PDF malware analysis — malicious · 9e2a5db06ff2aae3

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 22:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 57057d13ed112f7f530dfc9f98c24460 SHA-1: b01130f405c08892780f25da460e1a0df52a2046 SHA-256: 9e2a5db06ff2aae35d85aef180306017b7da61c2c87e44acb169308b5af2394c

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 URLs pointing to compromised WordPress sites, 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 PDF is part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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=which+way+does+arrow+point+on+furnace+filter PDF link annotation
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081645699722---jabumebuwe.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/73d9293a89be9cc8428ec5c4001f8a5f/tefir.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mqp69t66vafugimjp9b5c4lu4g/fikolodalubijiluri.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/46lpjlc9bcffnid7t9a10aprmq/junovazagemiraxexopej.pdfIn PDF document text
- https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/agu40htjn30fq1l8bjf8d0akl1/1162285055.pdfIn PDF document text
- http://mindentudor.hu/userfiles/file/savivotajawafuxoxiv.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf941447c---18283280641.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb610da02b---rolezojikisewodoruzatuw.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607217afce178---98734149451.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0d718039---69087138918.pdfIn PDF document text
- https://daaeportrett.no/upload/file/najenunetuwirisa.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8d42902c---dezavisimarudinopanusema.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/34881991044.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ef451155---wetojulawojajafaxasejux.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddbb11e4e---minerewaxefufojokiv.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4db7b447---16385908313.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0dfed451---jujaweju.pdfIn PDF document text
- https://dock-levellers.com/upload/files/53291438991.pdfIn PDF document text
- http://ahlhy.com/uploads/file/260052497789.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/95c526db178402ad54e50d8d8045e854/zidejawuluzogekavugaguje.pdfIn PDF document text
- http://studiotecnicomartani.eu/userfiles/files/buwazukufupokoju.pdfIn PDF document text
- http://toastwarenhuis.nl/app/webroot/files/userfiles/files/58859787542.pdfIn PDF document text
- http://av-jet.ru/userfiles/file/jezubogofevigebelojidiza.pdfIn PDF document text
- http://amadpich.com/userfiles/file/95306863727.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_off0000f6fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6FC	11012 bytes
SHA-256: `76eb41a3632c1c5ceee2af86ce8b075a7f3926c101a64349a17940f19de22b19`
`font_01_sfnt_off000110a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128B3	17280 bytes
SHA-256: `69f13caf6c2defee63ed8ce20dbf1e1662601d398c0a005de173636fe5c0271c`

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