MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a compromised WordPress upload. The heuristics indicate a link farm on disposable hosting and a lure related to invoices or payment reminders, suggesting the document's purpose is to trick the user into visiting a malicious site. The ML classifier strongly flagged this PDF as malicious.
Machine Learning
- Nyx PDF Classifier malicious score 0.9977
Heuristics 8
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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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Urgency / deadline lure low SE_URGENCY_LUREDocument contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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Fake invoice / payment lure low SE_INVOICE_LUREDocument contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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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://oniceh.ru/uplcv?utm_term=invoice+payment+reminder+template
- http://abpjse.news-read.com/upload/files/vufizibi.pdf
- https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vevavakilibeza.pdf
- https://morethancars.eu/uploads/edytor/file/vobegorugimuwelajinutuv.pdf
- https://protradingindia.net/userfiles/file/56129522270.pdf
- http://montaze.org/democms/userfiles/file/24405088927.pdf
- http://thesei.com/
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/895ea7a28dc1ce86e47fe4316a519c82/96475219016.pdf
- http://www.polni.si/Images/files/5606939497.pdf
- http://pop-around.com/file_media/file_image/file/90361695573.pdf
- http://exima.kr/userData/board/file/83218660582.pdf
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e470552393fe7f49c4608d116ff4a19a/66770936684.pdf
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u7er6l7uhlaur67vg1oiorq2f9/sufudomonobibed.pdf
- https://crmsaas.dswip.com/ci/userfiles/files/92648870943.pdf
- http://golden-candies.ru/webroot/files/files/70781731677.pdf
- http://midesignvn.com/uploads/files/74294053167.pdf
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1615a95937ca8d---57434728172.pdf
- https://ph2020.org/FCKeditor/file/5159696397.pdf
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/15a7rcpapt4lju1llv0tr5jlvo/lewarideve.pdf
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9qvirafb2869hnjt38fdeh2bhv/70236276388.pdf
- http://ucg-eg.com/userfiles/file/lepob.pdf
- http://ventiliatoriai.lt/js/ckfinder/userfiles/files/gazubopexudetesadomidola.pdf
- https://cvzona.lt/resources/img/files/1365409833.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_off0000fe7e.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xFE7E | 16792 bytes |
font_01_sfnt_off00011695.bin133966fedbb95b4743684b880b55979557541b3ec37393bec1b7b6b35da54311 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x11695 | 10636 bytes |
font_02_sfnt_off00012ee5.bina9f20ae3e5c564f36e28414a9dc071c90cb0b46cc1c27ad7e77a685eaadbb802 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x12EE5 | 19792 bytes |
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