MALICIOUS
196
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.
Machine Learning
- Nyx PDF Classifier malicious score 0.9975
Heuristics 7
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ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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Browser extension / update installation lure high SE_BROWSER_INSTALL_LUREDocument tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARMPDF 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.
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Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARMSmall 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.
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External URI info PDF_URIPDF contains an external URL action
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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://crysiq.ru/uplcv?utm_term=2019+sat+answer+key
- http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/64072954658.pdf
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f5654e16---96922226171.pdf
- https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/kabujotexakujura.pdf
- http://sns.hu/_user/file/26462174564.pdf
- https://luatkhangthai.vn/upload/fck/file/75339416677.pdf
- https://tiklatakip.com/calisma2/files/uploads/guzonadu.pdf
- https://songhongresort.com/img/files/409207263.pdf
- http://seoulgreeter.com/userData/board/file/83406422589.pdf
- http://rilta.net/userfiles/files/kexeromawowexelazek.pdf
- http://speckrepej.com/upload/file/21742179016.pdf
- http://bsp-plovdiv.org/ckfinder/userfiles/files/likikasobumonera.pdf
- https://clearpatth.com/userfiles/file/17407853459.pdf
- http://tokyosushilohaus.com/uploads/files/45690587782.pdf
- https://afritransport.com/app/webroot/files/file/77839658034.pdf
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f797cc22e---tujotevezek.pdf
- http://media-production.net/admin/ckfinder/userfiles/files/sabofevakimapuda.pdf
- http://hndgyl.com/v15/Upload/file/20219427257092.pdf
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613546ba2034d---2476501327.pdf
- http://vom-ragnaroek.de/uploads/file/24282625647.pdf
- http://gabinetortodontyczny.eu/userfiles/file/jajetor.pdf
- http://rw-hse-businessconsulting.de/userfiles/file/fizipejirexibo.pdf
- http://dayuntang.com/assets/uploads/ckedit/files/20210905070819.pdf
- http://satunatc.ac.th/ckfinder/userfiles/files/mulejujawiva.pdf
- https://aprenda-atdi.com/uploads/files/54024405192.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
stream_005_off00011a3a.bin1dc9445302cb425ef69799da2dfb936c3baddb6f6421fa85d6f26017ac1b862d |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0x11A3A | 10500 bytes |
font_00_sfnt_off0000d739.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xD739 | 16792 bytes |
font_01_sfnt_off0000ef4b.bin21dfad4b3aa98fb70e62c678ce6d76d33d881e64fb86b27fe3821669ca8829f1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xEF4B | 16576 bytes |
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