Malicious PDF — malware analysis report

Static analysis result for SHA-256 520108c869c442e9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 22:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 493d1c50e4af5ea857e5f7ef9b149f37 SHA-1: 7b54c9275f17ab52d8da3d0c2017defdc7739ed9 SHA-256: 520108c869c442e92867d4318ab68c3b203569cd1fbe2b3c7a8fa6bf019ca0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=computer+numerical+control+of+machine+tools+pdf PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/br3vpvsto31keqorfc0b7rao44/zozonarimogixepoxemi.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/nativuzoponagijefu.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/poserijexi.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1624394580454.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6mof0i4cqb2g4rv0lsoinhs266/99772066566.pdfIn PDF document text
    • http://industrialdevices.in/uploads/46569869593.pdfIn PDF document text
    • https://ever-progress.com/upload/files/zoxixivunepupafuwaz.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/soguw.pdfIn PDF document text
    • http://glttek.com/userfiles/file/lusaleparusejazufaje.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/27925873225.pdfIn PDF document text
    • https://cecprint.com/images/file/zuxiwaxebogalav.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ab09312e2---bezudiresizagogesitekebok.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/koworilaropopaxotix.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/65604310313.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/tajamisusatuwivefon.pdfIn PDF document text
    • http://rotang.net/userfiles/file/57592836640.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/67321721195.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zaradogixijat.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4db05ca0---dizubobulewikitepur.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/caccd6c1cbbdbb2d18d05c68955074d6/siwefaguwilawali.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/samuwepanojeluxovone.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3cg4v5t3o81dfi7aeis51nglol/vanakuwuji.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6a135021---wuxerokanisu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/vofijaberutiw.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/85621058188.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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 18332 bytes
SHA-256: 95159b3b6cd3e9c4e6b611d373aa3e7f531ca21ef9d08ea23e8886b2bf9934e5
font_02_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 11016 bytes
SHA-256: 6ca80fa6b772474654b56552677a5e370097788de019da22635cb8aa17fbc5d0

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