MALICIOUS
204
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The sample is a PDF document containing embedded JavaScript and numerous links. Several heuristics indicate that these links are part of a link farm, with many pointing to compromised WordPress upload directories or disposable hosting. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to a malicious second-stage payload, likely a phishing or malware download page. The ClamAV detection and ML classifier further support its malicious nature.
Machine Learning
- Nyx PDF Classifier malicious score 0.9976
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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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 http://sial.pl/galeria/file/50600529381.pdf
- http://cyc.cz/pictures/clanky/files/73339984011.pdf
- https://maconlux.lu/userfiles/files/21828435585.pdf
- https://devisme.maxtis.com/userfiles/file/21587614685.pdf
- https://sfasg.jp/js/ckfinder/userfiles/files/78003603861.pdf
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613159051f49c---73385907775.pdf
- https://assofmt.org/ckfinder/userfiles/files/14110302127.pdf
- https://tenderdiary.com/ckfinder/userfiles/files/fubinofi.pdf
- https://vinniescustoms.com/userfiles/files/vuvojuwijuwutaromu.pdf
- https://gsm.company/ckfinder/userfiles/files/rewatopexaxumoguvilezava.pdf
- http://wib24-admin.de/uploads/file/63189020566.pdf
- https://m3nan973ru5-pa571.com/contents/files/47986868212.pdf
- https://mygenius.ru/admin/ckfinder/userfiles/files/bamopazik.pdf
- https://keralatemples.info/ckfinder/userfiles/files/96892649937.pdf
- https://mimpishio2bet.net/contents/files/tapel.pdf
- http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nurepetofo.pdf
- http://2safe4u.cz/UserFiles/File/pazarerog.pdf
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8b0413687---68885642406.pdf
- http://tencanpowder.com/d/files/wefogidumufunomeb.pdf
- http://sziszolg.hu/editor_up/xipekaremogadezixuwele.pdf
- http://aprt1day.ru/file/wigesapem.pdf
- https://serka.com/serka/upload/files/55577244117.pdf
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/95e7a52ec102689f67de958130aabb51/bemevik.pdf
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=moving+apps+to+external+storage
- 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_off0000b5eb.bina6067fc6f453d6ca3498c9417b9fc127e9020acb23a1a4a84aeb4ef7cbdc6df4 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xB5EB | 17668 bytes |
font_01_sfnt_off0000e324.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xE324 | 16792 bytes |
font_02_sfnt_off0000fb3b.bine9126696ab83759510ae2b351769df855a41c796026823878939e64160ffe69b |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xFB3B | 10588 bytes |
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