Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2f3cfef63cabb3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 07:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9886b7d5d19b7b3f44f1812d90aa774 SHA-1: 869e0d943466e0df6b719071847ea081c8a0560e SHA-256: 8c2f3cfef63cabb3243b1000bf9804480c680221ea95af0e2bac1b9212492c2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, indicates a link farm designed to obscure the ultimate destination and potentially evade detection. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://macabrey-luthier.fr/data/Files/8817584006.pdf In PDF document text
    • http://ifa-astrologie.de/userfiles/file/96918657648.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/vivif.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/67418964087.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fb90ad70---33216993074.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca7b0a003---79137020376.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/20541999430.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/33875538378.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zubofuvap.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/58195015548.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de1cf279988---jijobofota.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33af5cdcc---mukuxabofulirimitizazoba.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b36f2aad388f235c346dcb32ea754b7b/vexolekirigodifinuvo.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/koxari.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gapukesuvuzufevijurunexej.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160733861f16c2---femenojegevubopikonevo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/risafixak.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/62356927020.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/mukavowefe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b364a05024c---59458249117.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/70938376763.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/tupawiwipus.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/754dab9a359f1d7d2e4fa1b985fc726c/89495199121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=vitamins+while+intermittent+fastingPDF link annotation
    • 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_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16588 bytes
SHA-256: 17518094aec1a9f0b230e28fb34a73e6dc7b4abdc35a8d737991c069a3fd54b0
font_02_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10596 bytes
SHA-256: 2e930ef0a8886bc7e1ac94bccf61e8842cc1588a0b65b1ae8566a6f18cd19b67

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