Malicious PDF — malware analysis report

Static analysis result for SHA-256 426553bd65a15d81…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 00:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9020024057b88c99bfd4de07939ebb3 SHA-1: 92722fb7ddb7eb40bf8c431fff879f62ab470d02 SHA-256: 426553bd65a15d812a4349748f6e17f72e6f6dcecc9313049d96b0d1a53c464f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.biogreeno.com/cms/ckfinder/userfiles/files/97784851362.pdf In PDF document text
    • http://dailymaydemtien.com/userfiles/files/bodakogadufumemonividovum.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210909050400.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/45117364818.pdfIn PDF document text
    • http://zeci.nl/im/image/51583520977.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16135afbbc6409---1306154592.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zinalunoraju.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/44293885978.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/femefexedojopojalalemati.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16133a885d0d8e---ligut.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/44428915803.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/80742872751.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58697521195.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/57759723982.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xidiwerekimav.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109042005177738.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/to3g1pc1vklf6ffhh3qr5i54q0/zasijozijilanagatesip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130985f32877---36752080502.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a577242dfbcf60659c29cacd67256e/bawetojuforawijexisi.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/wuvagupiduripejusuzufesuv.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sesetudolovo.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/42357186818.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/172e4c3210158fe0472e200dc7c757d7/75874869435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=turbo+browser+apk+downloadPDF 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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 18352 bytes
SHA-256: d873b4c0b7232c2a4b41e00c17f52912426b47c4374b37b7d096e3c9bf96d65d
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10576 bytes
SHA-256: ac6c4c802c07dbc2dcf249b98602ed180bfcc3d0d90ea758c37b0d9beda60d82
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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