PDF malware analysis — malicious · c65b3fb97491aa2a

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 221b17bab24504a60fa7967169cc007e SHA-1: b2bfac64bed0517a4b8c0e5e5ca67711c2f8e2bf SHA-256: c65b3fb97491aa2adb85eaee3c05896370377e10588cf716d8618ca5e1207afd

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.7561

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF 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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small 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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One 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://pdww.ru/ckfinder/userfiles/files/gizudimoxuru.pdf In PDF document text
- https://alice-immo.com/userfiles/file/44385849946.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2d4a9a5c---69859195423.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/rv2tftmrt69jg1hp4ojtpe25j2/xupuzigavafigabesivar.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/20744178923.pdfIn PDF document text
- http://cbcom.fr/ressource/site-image/files/21711034446.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5uuqrnk0cgp57vtltfgrbflua5/vubato.pdfIn PDF document text
- https://i-chat.tw/js/ckfinder/userfiles/files/44804413142.pdfIn PDF document text
- https://polnische-zaune.de/userfiles/file/vatotevozegop.pdfIn PDF document text
- http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630196897.pdfIn PDF document text
- http://chatyzvule.cz/uploads/27854015439.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/796fdcdc25b6ae9edd3bfd2f19c151e9/26756550801.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085441199d59---44603177131.pdfIn PDF document text
- https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/plsetdm8uhfduuq05ps7v8bft1/76680464261.pdfIn PDF document text
- https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5fl56suhin3jsbanre10qui7nr/betunonomujifitomosifone.pdfIn PDF document text
- http://fritz-fahrlaender.ch/download/pabane.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/04mrsntv82lmnjl7vk2qmqsimd/95123259904.pdfIn PDF document text
- https://cincia.ro/ckfinder/userfiles/files/98555700766.pdfIn PDF document text
- https://savitravel.ro/ckfinder/userfiles/files/39555049602.pdfIn PDF document text
- https://kingdomdatesuae.com/userfiles/files/lubefijaji.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/getafakekolazinoj.pdfIn PDF document text
- http://elskenecologie.nl/files/49537568325.pdfIn PDF document text
- http://51-lq.com/userfiles/file///72453298895.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=translation+techniques+with+examples+pdfPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e29d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE29D	11284 bytes
SHA-256: `86fd44276e4f4e0858f51e40c2aff3d5ef8dc51fb5ce9408d12ff758618d096c`
`font_01_sfnt_off0000fcc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCC3	19560 bytes
SHA-256: `c1c8d6190267c961597483c048bcb9331b183fb1a2a63b1265ca02ff3f78fe3a`

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