Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53bc78ad88e7ea9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 01:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eca51569f6bd57a418aa49b7bde6b180 SHA-1: 9626967c7d6e2fd6044a78adf970e9800505b093 SHA-256: c53bc78ad88e7ea92f298b5f0989a6cf305c7ba803ddcfe3d1979b0ff25c6b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to distribute malware or facilitate phishing attacks. The presence of external URIs and link farm heuristics strongly suggests a role in directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=interior+angles+of+shapes PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ccea5e8efdafd547fe249b5d4e16765f/67989102841.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b53bddeb48f3aa9d8d7159acaa871cc7/88365014271.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607286b8976dc---semotumajofezexumiwisona.pdfIn PDF document text
    • http://4bx.pl/public/file/66736004240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5756343b5d---30501241809.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gidijozomita.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160935e5ac37fd---waninurigu.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/68265965546.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xuxazonanijabekumosomo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c3399a62---pibonut.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/vajenebi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/jedutilifuxabopesiweg.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7761050329.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2af5cee47ff2a7cc8ce8c2344bf98568/90505438651.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/40524367665.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c49428c4---fepigu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/18162173312.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sngfhhbqlc2fstpoh4vp9f4vs6/dalujirugewadopelaxinab.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/43941132d70f9ef3c5cbf5271247bd35/saropixas.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec55b4749---memuxudonol.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/53549900880e3ae52bae84f6399802ad/87842215930.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xelinifix.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/56635387968.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7sfhbsph6hm4ed1h4e6uduhamn/68412665433.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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 18404 bytes
SHA-256: 64b03ea58aadb84859e00282b869c88c658e7eee2ff0505459d04245210cc127
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10588 bytes
SHA-256: 38fc6125bc1e0570bbf3e8f7f18ecab311f2d9af2ccdb93841ab7dd06d77a30d
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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