Malicious PDF — malware analysis report

Static analysis result for SHA-256 8679dbd384dc3705…

MALICIOUS

PDF

69.6 KB Created: 2021-06-13 03:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c2535ad351e83534f782a91d02d3f805 SHA-1: 449171fd75ac13908fc25c6a720a28d5ccf4dee5 SHA-256: 8679dbd384dc3705d5e6ddc67a8e8999e62ab221c0303c918e779844c5406422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs and link farm heuristics indicate a strong focus on directing users to download content, specifically mentioning 'vanced youtube apk free download' in one URL, suggesting a lure for potentially unwanted or malicious software. The use of compromised CMS upload storage and disposable hosting for PDF files further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=vanced+youtube+apk+free+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098433557f91---zuzelaxezirufaxasipu.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/18321567199.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1p6j2kio9cudhbrqkhoijaf1jq/jabumu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/91bamnpopmqc3q6thte1opgcm6/57937618412.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/83598554310.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/megubuziwarep.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/zusewupe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ganav.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vqbb2opt9v212ere7cd6vf4duu/15978769334.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/30bb605bfe5875d89efcbfb5cee6040f/surasixapog.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f21bfc27---641374302.pdfIn PDF document text
    • http://stattus.com/assets/file/40522141522.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/detofesafewakifiwifoja.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4b1cc9f19aaa52bcc76bafbea5d9c827/69417776906.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608180dc23d5a---vojufuvavavuxexarumix.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48254b8bfe---35854399022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 5168 bytes
SHA-256: aa6c429ad11ad569bd0f821d6a4304fb1b1d565d3894f27cc2deb309b63be6c1
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 9960 bytes
SHA-256: f1858c790700872a2af440008dcde04e454e825e3b27eaa11cea96e4f802eafa
font_02_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3