Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d37afa298ec57b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 08:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb091ccc9aa59ca6d095c671ca170232 SHA-1: 738c12330eaaa7232aa9b605722b769ac6a692fd SHA-256: a8d37afa298ec57b56c07c89fb1ec5f2ff45edc6dda5d570ed9ae2b2c2b296dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier assigned a high probability of maliciousness. It contains embedded JavaScript and numerous URLs, many hosted on compromised or disposable domains, suggesting it's part of a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the 'PDF_JS' and 'PDF_URI' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://inwebjor.ru/uplcv?utm_term=monument+valley+apk PDF link annotation
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bamakofebozaxora.pdfIn PDF document text
    • https://theurbanthinktank.com/files/gezozaposi.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/fotoruwusubig.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/54722769952.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/57148865244.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9bbe992033308cd631decbd50f405d43/walanido.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613134f582ef5---kimubowejowomelop.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/91717805808.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/86780445530.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/88262141688.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/64500783207.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/70118117553.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/95629226039.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/76061978640.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613877c60a2d4---55299080372.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/44292811231.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zuvozorej.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/1695150532.pdfIn PDF document text
    • https://wildnaturetravel.com/File/zuwowosudam.pdfIn PDF document text
    • http://calisnt.com/uploads/files/toverezam.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/31137828071.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/tidavuzofoj.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/puzalij.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/pavuxaveda.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE29 10416 bytes
SHA-256: 4403f9cd64fab5a9befaa566a7353ec6833237db9f8da388c5a82b04a718e633
font_01_sfnt_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 14820 bytes
SHA-256: 8264224521762b9979c14b12cd7fdd79cba1d36902f427cd1b38818547b6c581
font_02_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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