Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ba43837b215652…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 14:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5058c67f18b3760ab6e28737cc6994a SHA-1: 0e41832ef2e20ed6ff051519458435a07f0e7439 SHA-256: d5ba43837b2156523df2e6e0b3cb6529d5055b8549951bea11cb2d4e5db80ca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it's part of a link farm, with several URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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.
  • 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://ktcyy.com/ckfinder/userfiles/files/37571349651.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909033250443220.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/88610155910.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sosanopomukafanepo.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/77430629803.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/49416194216.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/velumosavujaruwigonaxepus.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/kunixuwetukogejovujipekif.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/99931325516.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizapimonepegifexiku.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613afcc8caf80---60408762744.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/gekedi.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pavapabe.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/vulige.pdfIn PDF document text
    • http://szcftz.com/upload/49879576387.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/kutupasesisekup.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/90454871402.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/66717547466.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/80302092778.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3ec75760ab5bcbdd29b0c907ee30ee99/42683015533.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/xaxinaraluwidabofepuzojo.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xanawukajiwelob.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146affbd511e---50154184546.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/fopujesoxajideganovezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hidden+figures+download+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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 10608 bytes
SHA-256: 010161ba1c9a4aab91959da0e9f4ab85b55914112b02143a077cc8be8a56b555
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 17924 bytes
SHA-256: a6afb019729ab75e1a34cbfb5f33f8025d144661c68ac48c00fffbe5a851015c
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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