MALICIOUS
172
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The PDF contains embedded JavaScript and multiple external URIs, including one that impersonates a shared mailbox auto-reply. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The presence of embedded JavaScript suggests it is used to facilitate the malicious activity.
Machine Learning
- Nyx PDF Classifier malicious score 0.9994
Heuristics 8
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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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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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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=shared+mailbox+auto+reply
- https://nguoixunghekiev.vn/userfiles/file/wilurarenuwipoge.pdf
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112e07f9a93e---miritonenalerugarulax.pdf
- http://5mal4.de/moneyvidya/web/images/userfiles/file/bukasedojet.pdf
- https://chinatupai.com/web/js/ckfinder/userfiles/files/dibeserudosovi.pdf
- http://ndt-ultratech.com/files/zetorafezera.pdf
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e516cebdb---98486106831.pdf
- http://alrabbancapital.com/file/files/41346721047.pdf
- https://ost-fogging.com/upload/files/lesoliwuvetezigexef.pdf
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l7q0nlu99m7e4ode34o7e6l1jk/59795078030.pdf
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b76273e69---xixiwenifivax.pdf
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9980d75bd---66345504162.pdf
- http://knshzj.com/CKEdit/upload/files/varupudomujobixerifa.pdf
- https://espiber.cl/images/uploadedimages/file/rizunode.pdf
- https://mlmrockstars.com/ckfinder/userfiles/files/tuxukinaxekib.pdf
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094471192e7d---74204352606.pdf
- http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/kaboraruvadolugibit.pdf
- http://britishcytology.org.uk/ckfinder/userfiles/files/83530647181.pdf
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d930007e484fc33421b589542a61b4bc/bakifubofat.pdf
- http://cbestdesign.com/ckfinder/images_store/files/dinogafofubuvajedarateza.pdf
- http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/vowisevazodubuwuf.pdf
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e7r23m2rae6qmd01k7qbhmvqog/dasaw.pdf
- http://rinsacars.com/files/others/tikilijejabadazajimix.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_off0000f936.bin7c7ac13328a88ddd0a1c1518e0e78620be45e5278d27f99521c5680c50f336ad |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF936 | 10916 bytes |
font_01_sfnt_off00011246.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x11246 | 16792 bytes |
font_02_sfnt_off00012a58.bin27f120d57c4683bab643e4dae967089aab79e3af51708e4594c6efa08eef8b5d |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x12A58 | 18880 bytes |
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