Malicious PDF — malware analysis report

Static analysis result for SHA-256 3090aafa76562033…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 01:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f61e4b38367447c149e1b5d2e60a1fab SHA-1: a846ee3fd169a21fdc798c1d2f4c633925073d32 SHA-256: 3090aafa76562033e5666e13158b30cb2d378417eb759c05dede998471371c35
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b48866fd2c0b7f7a1ff72df900783687/66124526590.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/gafinajizituk.pdfIn PDF document text
    • https://allianztc.ro/files/file/samurive.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/rikejibixewuz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/k5legns2t99fq2vtj8fqkaip8d/toburowomuxijisutemunuxa.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/46603307726.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wivejajajazisefudozabisux.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/48963879823.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/33460659082.pdfIn PDF document text
    • https://artbynela.com/uploads/file/defenilupilutewuzinivej.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884337b8c19---vegopugomeketulapiviriwe.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/51795672294.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nakijidufopa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d099f355---pazotigipavodedidekusoda.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/rizoropusumoxisopum.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cis9tnglcan5k6sk2quijsu9n0/vitarigepivisem.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/zanibaworevulemewapiri.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c905dd21d6f---vuweravorex.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd916ce72---89727043949.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/53095493798.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e3754432a---22650851280.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pireleloxuvonediwukig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=corporate+communication+strategy+pdfPDF 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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 11160 bytes
SHA-256: 30277fc430864e613d67a3ee5a630aeed91436f0cda3b830d65ca3d018a3b138
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 16564 bytes
SHA-256: fccc074502bb62e0564bd5d3ecb5ea3ad346b17de9105cbd5d41d216efefca18

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