Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e88bf54b041ea3a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 12:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5a6443aebf00c19f90ad99e69ae9d35 SHA-1: 6a6408a509fd10c05acbf7bd685078f2bf223ddd SHA-256: 6e88bf54b041ea3ab725dbb4fc2d59817dac603d0acbf4e9583db1eaf34d79cd
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spirit-legend-enterprises.com/webroot/editor-uploads/files/vesedodezowa.pdf In PDF document text
    • http://netmode.net/app/webroot/uploads/files/vabewuvotal.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/33364001668.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631033774.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/xofagewugunepotatako.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/japelawabus.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/8928818656.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/wesezidoxanemin.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/13204736581.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lubumiwep.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/loxogen.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tipilebaramonunaretibarop.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/41206469187.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/narifapogi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d185129ae1---xiferawuzalogixipor.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pivowaw.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/72488503498.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/55229506387.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906005121797.pdfIn PDF document text
    • http://4yoga.by/pics/files/13758593830.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7cab1898---15235338961.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210908_EB31009BB4DB5F1D.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6bf493d188541ad08cc8518b77103789/tetatoduvekubekozi.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/53304611968.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/27704088087.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/87114883821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=online+convert+pdf+to+excel+online+freePDF 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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 10476 bytes
SHA-256: 159c8dd6b30dcfd2994d2f14757921b29b5527288b08901cdcee678274098f95
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 16644 bytes
SHA-256: 8b76a530268e2031f9ed92efac2e888a50b48363ede5d5cbd3d046a096347a3e
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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