Malicious PDF — malware analysis report

Static analysis result for SHA-256 4599c56aa06b1b6b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 16:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c903891c1ce21e68d78e52a9678d08f2 SHA-1: 35c30a95030e6e74130e6bace5fb1e6a76ba0e6f SHA-256: 4599c56aa06b1b6b93dec1ca6d508c51d5dd9e592d55b4f1ec828efac1a67570
196 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social-engineering attempt to trick the user into installing malicious software or extensions. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving a drive-by download or a link to a malicious site that exploits browser vulnerabilities or prompts for a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://przedszkolenisko.pl/userfiles/file/15278585311.pdf In PDF document text
    • http://cpgny.com/userfiles/files/47713227624.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1807f778659683dc5c607998ceed9b74/zarepidemuvakuxabubi.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/perijezepikakavasaji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad09caa62e---wimaxiwekepojuni.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/jejijixelinojo.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/vonupigejekaze.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/88605003956.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/96047077214.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/34322427443.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160998a1433bfa---51308696705.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/i32bp8oncbs69iafg792ro35hg/lubomok.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/29547602374.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bukukegaxurelutiwezup.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dukekuzisunijedenurexowo.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/25787715328.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210624_130616.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a10p5ecb1hlc2v7ooqb32u9ir5/39519376356.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/1951186748.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/jenumina.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/32677451010.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/4308d7ae0791f213e8d7e4614c668766/33677517372.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e784527c---lenapejidasiluwunobuwe.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/bilegebabelijidovew.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/lusexeparutumupu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc2e1bc9f---bumiwobutararorajipifuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cancellation+of+employment+contractPDF 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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10620 bytes
SHA-256: bfe4be5c14c812148cab9f300628190b492021bab98116e714aeba5673b18ae4
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 16100 bytes
SHA-256: 8404c2e82a53606687185abcc8006cdcbf9d009ada521a89a45d7ee457d3ff60
font_02_sfnt_off0001336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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