Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cca55d4a955bc3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 23:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6459b237394f64ca08ab7c480267b7c4 SHA-1: 9f261d53c4e6157f2d93884763a621fd0ade7170 SHA-256: a3cca55d4a955bc3a21c28c100e8ef0f4ec3673cfbfded30aee8a8ee192e6e8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs and the overall structure point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://xetnghiemadndanang.com/upload/userfiles/files/12436809005.pdf In PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/26994895647.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/dafabamixem.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/38894100771.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sh4n9laud3oaiav9gcnplssgpa/sifinelokejifopuvita.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/movubixoguwikawomirotulu.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091601053273499.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/76173812326.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/faxazedikazu.pdfIn PDF document text
    • http://medrea.ru/upload/files/60521602689.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141676c886f5---60845913501.pdfIn PDF document text
    • http://wixoon.hu/upload/file/83112214262.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/84897356614.pdfIn PDF document text
    • http://alltechsro.cz/files/fikiz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b80abe2---52181654657.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161305da65b45d---88452370788.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/80730327640.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/73230571242.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/2618431844.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/87a5ac8652bc7995ce83cbd11b35046d/barusozosekowese.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/66925357297.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ginibumej.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e3a799c6---beliwalaxufa.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zutumilu.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/20266651652.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/winuzupinewezerinujetifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=night+eye+for+androidPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/funokimukerijuzelosub.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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 16780 bytes
SHA-256: a9f94fc4a61e80d49e231bf6f671e79426543e4f83ca81b780f440692e43fab7
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 10508 bytes
SHA-256: a9a8cdeea5ce8b73b7a4e2a3522e3e678b415a0b592466eaba890b2fb983e661

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