MALICIOUS
164
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.
Machine Learning
- Nyx PDF Classifier malicious score 0.9822
Heuristics 7
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ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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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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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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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://chcial.ru/uplcv?utm_term=conditional+probability+problems+with+solutions+pdf
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o76olv6r7v245tsvuta8bsgvp5/65619468149.pdf
- http://kondicionery-vidnoe.ru/upload_picture/file/13596399190.pdf
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607759705b80a---18364852915.pdf
- https://fratellifurloni.it/file/wuwapopepegupi.pdf
- http://victoryelectricalsupply.com/ckfinder/userfiles/files/zomifu.pdf
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tfa7ti373mbn221io32ls7o4f1/41981228146.pdf
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2464d01e1ba84c45b94a03c0c4c367d8/rukirotimopuzew.pdf
- http://teenaramainc.org/clients/875997/File/20887053558.pdf
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805965b8e3c---56977711530.pdf
- http://akkoryazilim.com/userfiles/file/vewipobetukojawubolobokig.pdf
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fdacc439b67da64c34274ac1b3dda742/lever.pdf
- http://4reality.cz/userfiles/files/megemazatalujizuse.pdf
- http://harrisonfamilyreunion.org/clients/868801/File/tusebazavabimegutituf.pdf
- https://smartcirclegroup.com/userfiles/file/17311430148.pdf
- https://charterboatdeliverance.com/uploads/files/85245654402.pdf
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8892bd2789add14c336b6f1befb77c99/babovizofifopisa.pdf
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j28s9st17j6uj9qbga5kv4pdo0/21955951188.pdf
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160887d9259e5f---1162837198.pdf
- http://augsburger-dartliga.de/uploads/file/makosisunate.pdf
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/23a6bdd0027731d2ff8ab43c7336345b/91930598359.pdf
- http://ctmmaximoravenna.com/ckfinder/userfiles/files/26793760267.pdf
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160760575a8d60---28485350926.pdf
- http://lsbwg.com/ckfinder/userfiles/files/20210701/1946043614.pdf
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8e5cf9d5c226adeb5afed078d02c827b/75668535690.pdf
- http://sincaremedicaltour.com/js/upload/fomazesokosezipo.pdf
- http://servis-hradec.cz/files/file/26951231348.pdf
- http://guowangcable.com/d/files/dabulesef.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 |
|---|---|---|---|
font_00_sfnt_off0000f77d.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF77D | 16792 bytes |
font_01_sfnt_off00010f8f.bin4ac65168f0740831cdb4f2fc4784f2878c25a6d2ed79b5f1ca34cbe20a040e35 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10F8F | 17620 bytes |
font_02_sfnt_off00013e51.bin8fbae060a066d2c821b85a3e973ad02436263c9ad3abd7a6009c3e588f0518cd |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x13E51 | 11232 bytes |
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