Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2564b3d0d0052c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 12:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f77a2f8ffb8d6a34d9c14070d57dfabe SHA-1: b9042cf97614ab8106633f4f32eed559f1a0ae4a SHA-256: 4d2564b3d0d0052ca6ee4d1808e48ae05ecccfa9dbfd1a91c162d62d8715bca5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jlm-kg.com/uploads/file/vatifeminagaxodo.pdf In PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/24219501963.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/solawasero.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/xopokukanizub.pdfIn PDF document text
    • http://goodmax.ru/i/files/22799922455.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/64d9d6fb582863d9bdea07eb6cb3f099/kujolofatakapuzoworuduz.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/vipimarunabo.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090401475573499.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/21837607462.pdfIn PDF document text
    • https://trexanh.net/upload/files/bejimerewuxefuredukisapaw.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109140230498192.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/sirutolumoregijitosa.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///nuvinojijexakofenuded.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141145738764---boxepemugosatuju.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/letarit.pdfIn PDF document text
    • https://yellowstonewildlife.com/zixilowubefe.pdfIn PDF document text
    • https://ubranni.com/uploader/files/javajeluremopedo.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/17617450791.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/mefan.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/voranifawowara.pdfIn PDF document text
    • https://arerp.kr/data/file///nanol.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/96282433868.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/33951554184.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d008813827---13890349369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=omegle+random+video+call+mod+apkPDF 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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 18036 bytes
SHA-256: 66f661283de532542736bc6d37b25e1fc7dfd5a4954f46b3813e041d60abf59f
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10772 bytes
SHA-256: 70103be480be313aa65e93962f17476dbe4edc4aa3d459e541f119592794bc6a

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