MALICIOUS
172
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple PDF link farm heuristics suggests an attempt to distribute malicious content through compromised websites. The document body is heavily obfuscated and unreadable, but the heuristics and numerous unknown URLs point towards a phishing or malware distribution scheme.
Machine Learning
- Nyx PDF Classifier malicious score 0.9942
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 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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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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Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTONDocument contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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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://cn-noah.com/uploadfile/file/86809574462.pdf
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b01b6569e---wujaminegozowakalev.pdf
- http://burmeseburmilla-allevamento.com/userfiles/files/pevufilalolojiponined.pdf
- https://vandolderskb.com/images/usr/ganufu.pdf
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b12897730f1---42811157363.pdf
- http://podlahypilat.cz/admin/file/82595309567.pdf
- https://amgaa.org/temp/files/gudezunusi.pdf
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/neul2hnrelhoqk6gd3ht68i4vq/juduvuputufakix.pdf
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4o7simb19t66g3vhtsciki52u1/tadimasilakake.pdf
- https://egokituz.eus/files/galeria/files/nalafelunojo.pdf
- https://castel.ro/userfiles/file/61175565783.pdf
- http://kondicionery-ivanteevka.ru/upload_picture/file/daruw.pdf
- http://skolicka.eu/foto/images/file/dixiginede.pdf
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092727a7c388---zusiwurat.pdf
- http://prplus4u.com/ckupload/files/3212364417.pdf
- http://nsdadventist.org/FCKData/file/muwuwewobu.pdf
- http://imcborivali.org/userfiles/file/mixaxodefovexaju.pdf
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c345614b9ee---nolile.pdf
- http://eau-msu.ru/ckfinder/userfiles/files/buxajapago.pdf
- http://sungder.com/upload/68239853943.pdf
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c78357127---10202110219.pdf
- http://101-games.ru/images/uploads/files/89612046308.pdf
- https://sweetburden.com/upload/users/files/60991713335.pdf
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ncert+physics+books+for+class+11+and+12+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_off00012925.bin728da6b2a945c209cbc0217bceae8611e4c761a1abf01de776749b05ad1cee2a |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x12925 | 18956 bytes |
font_01_sfnt_off00015b18.bindb94d4f8526b52ea985cec7e365ba5047b13ddd245c1b4a04035628b01788d1e |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x15B18 | 11212 bytes |
font_02_sfnt_off00017531.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x17531 | 16792 bytes |
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