MALICIOUS
164
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing operation. The presence of a lure related to 'Instro liker login' and the ML classifier's high confidence score indicate a malicious intent to deceive users. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for credential theft or further payload delivery.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
Heuristics 7
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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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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://infrive.ru/uplcv?utm_term=instro+liker+login
- http://wrtour.com/FileData/ckfinder/files/20210609_BEA6CA722785416B.pdf
- http://capesociety.ca/uploads/files/98711888029.pdf
- http://abpaluso.com/upload/file/degojimufuvorobox.pdf
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb7b75754---jazosumud.pdf
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e05362f9b---viwaratejasezaruwoxubosal.pdf
- http://bjjiffy.com/upload/nilolejazekon.pdf
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb07dc24d5---wekalalosusosivokixurumow.pdf
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879b7428af---92220305699.pdf
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609acafa9bd88---fatusolonifuwiwuwewiwaru.pdf
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8955b821b---botezafebe.pdf
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c1c4906d50d219073d0b16715903850/82957958747.pdf
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d56c88ffc---jamomofo.pdf
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/111710d5189d0dcd999d33a43eced353/winilebal.pdf
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cad81387fe3f2321b8d203fc48580b13/goteloturedatedosu.pdf
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942aef76d57---xajigoxifonizezevo.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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://scripts.sil.org/OFL
- 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_off00011376.binc191c5d91e682b9cc653df073ace489f6660e9ec2c1ffb0374f33d2b410e56a4 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x11376 | 4644 bytes |
font_01_sfnt_off00012353.bin02b6296eb0518731e2477cc42d60398cd2262c5af4dbf7ae78a6d24876c3627c |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x12353 | 11264 bytes |
font_02_sfnt_off00014a11.bin147306a5fa47f360c13f7477f9e60c86f491be611cc6684aba4643b20556f13d |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x14A11 | 16124 bytes |
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