MALICIOUS
204
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
This PDF document contains numerous links to external URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a 'Fake invoice / payment lure' heuristic further supports this, indicating the document's intent is to trick the user into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious content.
Machine Learning
- Nyx PDF Classifier malicious score 0.9972
Heuristics 8
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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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PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINKPDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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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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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://chcial.ru/uplcv?utm_term=please+confirm+receipt+of+the+documents
- https://dentalrud.com/userfiles/file/32781643862.pdf
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac812cbf3e---bizeketifinilodox.pdf
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efea368c28---47728995493.pdf
- https://pmsp-me.com/userfiles/files/segeruwuzateduz.pdf
- http://tpdw.pl/userfiles/file/maxolulif.pdf
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb033316e4---tizotanuluxutejumawe.pdf
- https://publicbridge.pl/userfiles/file/kexajeke.pdf
- http://developmentassociationofnagaland.org/nbloom/fckuploads/file/nuzemunafewolotijomifo.pdf
- https://alnahamgroup.com/userfiles/file/fivuzakorijajogegini.pdf
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f63a5efa---ninubusudufafomukuvedu.pdf
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/432f7ea645cb120169a855923393b32b/35112051626.pdf
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90184206bf---rowusuzunil.pdf
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abba70d3bfe---kotidurugasiwozubibopejaz.pdf
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/601699654a2bb3d963e5b112abe4da38/53849654778.pdf
- http://prime-standard.com/piceditor/file/lepokimotatadulebiw.pdf
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0c317ca62dcd63773d3c2a42c2a72111/18130378869.pdf
- https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/jowadavafozerenukumezoza.pdf
- http://cphs1970.net/clients/877309/File/zaputonuwisepuk.pdf
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a692dde2bb1---67664315546.pdf
- https://dgaspcsm.ro/ckfinder/userfiles/files/25941369132.pdf
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6697426d32bc59980c9e09a41702d3e5/54569877231.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_off0000e3af.bind935c2ba073b18a545273ea39679f85cea5623dbf2455218433a7372c04b5dee |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xE3AF | 16936 bytes |
font_01_sfnt_off00010f91.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10F91 | 16792 bytes |
font_02_sfnt_off000127a8.binc5edafbe4acbcd0b9594baf7a8f2de10038c5a766142694cce14bca24f5f02b9 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x127A8 | 10984 bytes |
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