MALICIOUS
176
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the heuristics indicate it contains a link farm and a callback lure, suggesting an attempt to trick the user into contacting a malicious actor. Several URLs pointing to compromised WordPress sites and disposable hosting were extracted, likely serving as landing pages or hosting further malicious content.
Machine Learning
- Nyx PDF Classifier malicious score 0.9990
Heuristics 7
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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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Callback phishing phone lure medium SE_CALLBACK_LUREDocument asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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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://pistant.ru/uplcv?utm_term=civil+service+values+and+ethics+in+public+administration
- http://ekhoron21.mn/uploads/files/62394850595.pdf
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d92d4b634f18231ea98218405ccfddd3/narul.pdf
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/395c5b4a4a7604cb2e1ab61600ab612c/63608451864.pdf
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c73d7a11396---34876166619.pdf
- https://muguet.fr/sites/default/files/file/kufumawudewadafudak.pdf
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f888fc39e9---34071342753.pdf
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093948714012---nozujitagomepujaf.pdf
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d9293edf14dbur5lb9kt1ch2mp/81811316319.pdf
- https://arket.io/wp-content/plugins/super-forms/uploads/php/files/7l73a86kf1hbs7klu9jr6ln0h6/51033403961.pdf
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6p1fa55dqdv5g5e26g64897u7/43300262442.pdf
- http://clinical-pain.com/pds/userfiles/files/60976574616.pdf
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56adc43dc7---29070832839.pdf
- http://berbun.com/user_img/file/14569023528.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_off0000f0d2.bin8c182523e0ec1ff0352cb0eba73acf2183a6f7660c6b6e63872abd76eb51f354 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF0D2 | 11116 bytes |
font_01_sfnt_off00010a59.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10A59 | 16792 bytes |
font_02_sfnt_off0001226b.bin07343b007eae40ba6eacc70bc7029b824e08c0e68c4715f8001fad0900697eec |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x1226B | 17384 bytes |
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