Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15e071df7d451d2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 00:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49a72841a2e5f001a54276326c275c8e SHA-1: c349b9eab79ea4fa3c77f05aed13cad18ac7c692 SHA-256: b15e071df7d451d237fb0d2b97773ed9f9ec3715d8c39160fb7a41b671b718de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and is identified as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Embedded JavaScript was also detected, which could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The 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.
  • 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://itemclinicchina.com/ckupload/files/nolinevoraporojebasuko.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/3777162622.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/826d9pjoftrcd6omo3ep17oi9c/60357692307.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/kaxowu.pdf
    • http://pm-ural.com/uploads/files/24369059434.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/jetoxomezuvizovine.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3790e379---pikelawanipirugud.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ee8b0e0---diranafewegeb.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/74fbdd1333997478658c370261c1e9c2/retog.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86612f1cfa---lezirexonuri.pdf
    • http://eksan-ltd.com/userfiles/file/xowawedevukosobus.pdf
    • http://inbjnews.com/data/cheditor/0603/files/84315116755.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/ruperagugepok.pdf
    • https://genegurumiraclehealer.com/userfiles/file/wonan.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/vosowatigobotelojin.pdf
    • https://mariellatriolo.it/public/file/mimevitapugow.pdf
    • http://infrabud.eu/fckpliki/file/datatowubutuv.pdf
    • http://mnogonomerov.ru/uploads/file/titizibefenafokugigasu.pdf
    • http://kursadowicz.pl/Upload/file/65059895947.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4c491542---19925416550.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea580c935---12894306437.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/duderutopiwopoj.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340af39d96b---72409985333.pdf
    • http://superfasttv.com/uploads/files/danadugozoguv.pdf
    • https://hobbes-group.com/upload/files/wesuwaxulasex.pdf
    • http://efeotokiralama.com/Upload/file/67437378538.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=english+reading+exercises+pdf+b1
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000de16.bin
f47c738126d7a6bcfcacdefa2e7147cd052624bf68f091f046a878620d5d0cd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 10956 bytes
font_01_sfnt_off0000f6fa.bin
3109237a953206020aa68b33ff595c5dea8d07259e2876d1cbe0fbb963e0a910
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 18128 bytes
font_02_sfnt_off000125cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 16792 bytes