MALICIOUS
104
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised CMS upload directories. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to a link farm, likely to facilitate SEO poisoning or host further malicious content, with the embedded JavaScript potentially serving as an additional exploit vector.
Machine Learning
- Nyx PDF Classifier malicious score 0.9942
Heuristics 6
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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=teacher+return+to+work+after+maternity+leave+letter
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f798b6998---23144291557.pdf
- http://ajisushionline.com/uploads/files/53757397453.pdf
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/okmvpkpmucbtrhvcr6g4nh79ei/kalis.pdf
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/04b0d647e8ca828e63e371a37b81592f/98379406064.pdf
- http://everest-c.ru/ckfinder/userfiles/files/golegolidoni.pdf
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f0b897d2cf8a6f5b9aeffbdabda192af/gesegokijobenajesag.pdf
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a600fa50cf73666229dfaf24da60640/68923673319.pdf
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/307s6p8q27j3qqhc4dt5iukvaq/98705532612.pdf
- http://rudolphalexander.com/uploads/files/43386125662.pdf
- http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/lmtnfak75duhhfl0v5dn8ast4pmtgae3/93674557802.pdf
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/982e533d74fc6cc1c779e6203c6fd967/dafoviboxilolobumidir.pdf
- http://perfekttorun.pl/pliki/4967158978.pdf
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbcc69dacf---lisibegasejitixi.pdf
- https://thai-airpark.com/ckfinder/userfiles/files/27401683945.pdf
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e1395464---17657386031.pdf
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5e67r6j60eu12no1uotb7k2s6g/27753484254.pdf
- http://sclifeguards.com/clients/16854/File/berebojatunewesoke.pdf
- http://stalmont.eu/userfiles/file/jawotak.pdf
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad2658f1c---wexif.pdf
- http://banglatalkies.com/dynamic-images/cms/file/69266625752.pdf
- http://deborahkay.com/ckfinder/userfiles/files/87866075220.pdf
- http://classiccar-jp.com/js/upload/files/xafidepefurolugolemujux.pdf
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4195ac0ed3219c0befaccbf6c799a361/nebukabirikorud.pdf
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/28h851tnppbf8ftr58j9ec8lru/manemuxafepuravumorajapex.pdf
- http://www.aqsclimited.com/EditorImages/file/ranifebulegotamudabovap.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_off0000f63c.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF63C | 16792 bytes |
font_01_sfnt_off00010e4e.bin535718a8f7341b53e068569cd1a93a1603dde04a9832e2e8daa38df31394f3dc |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10E4E | 16940 bytes |
font_02_sfnt_off00013a94.bin44a8d5ed8251cc56a7cdd30ba760a20111c2679f79158528b79037a754c9e109 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x13A94 | 10856 bytes |
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