Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbe1cc3914f056d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 07:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6b91e7e11dfdbaa0ea9ed6ec1876cca SHA-1: 8a8aa8ee5f4e7f30667c4be7f4b80933f1baaf39 SHA-256: cdbe1cc3914f056dcacf96e9dab2909fa4890e0ba8079560e97f28d4a19d735f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO poisoning or phishing. The ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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 https://laborke.ru/uplcv?utm_term=drag+racer+v3+android PDF link annotation
    • http://bachova-terapia.sk/images/file/xupadewezefugugu.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nekozip.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/20707383335.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/dumudowanabasomix.pdfIn PDF document text
    • http://maulich.vn/attachment/files/81782736445.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7f79lktofno39ifb01rgco2u2r/sewejinofajulew.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39347340697.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sakaxamevukujibe.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/tekobinoxatalosip.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/67576543856.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/besipifamalumez.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc98de4843---zigitaxetebapurawe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161427b725c90a---51526060888.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58a97197dd42f478b3c7aff972c6eada/45240886836.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/58942196699.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/noleruwafuzakuxevapekebaz.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/jedinukuzid.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21b449334---33789758167.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35211654175.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/womijutide.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tulijisiso.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/18361068357.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/1819588340.pdfIn PDF document text
    • https://mimpishio.com/contents/files/45510463698.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/nezemovogiwef.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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 19428 bytes
SHA-256: 359a82220fe48654805b8b7ddefe31ce0dfd2547bdcab84c40909c6af4f8ccf0
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 10472 bytes
SHA-256: 237a4f83fba662867861d0ae3b76ed829ef873aec8a555217d89a29af977fd7e

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