Malicious PDF — malware analysis report

Static analysis result for SHA-256 9492cb97f79ab541…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 01:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ec64463362a95b0b01175bc86db887f SHA-1: 0ab4ae03c08c743e26dec4b7f166120c1796c5bb SHA-256: 9492cb97f79ab54162cc5362ce7390bd1678474d790e68bc88d9e7a029f2f8f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=study+music+mod+apk PDF link annotation
    • https://alihuata.com/userfiles/file/63240266056.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/62018013200.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/lakowisefagemun.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/ruzititerobu.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/79676398708.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/58137446059.pdfIn PDF document text
    • http://cosyromania.com/media/file/tasuwuwefu.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/tovikewoperutumamifa.pdfIn PDF document text
    • http://kftchem.com/upload/files/wosisumu.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/gadojipavebe.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/04fd126d5f9d1e8c44f8caaaf16f7873/18337609108.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ead9f83e---vugotazevebum.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/61101upng08elvcjqmpmqpj3se/1386225876.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/23451626483.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388e918fe94---72465527246.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/tikimimamibuvikono.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389b55061af---vobaxogeligamazesiguja.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5dc5cc26---zomoku.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jasaxuzeb.pdfIn PDF document text
    • http://unsersohn.com/images/file/95692899486.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/nutojesat.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5777cf152---23966859946.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/voralajavutenuperodozobo.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/51822427476.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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 22332 bytes
SHA-256: cbc21850ee91fcdbec8a9fb01e5f32ec9bfa406cb215e4a841d8126b7a96ff0e
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 10672 bytes
SHA-256: 6d6df829ff42a02191a7e33fcca09065f46d3d0a2a81b55f77b9bf0ea298460b
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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