Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd981420ca8b8433…

MALICIOUS

PDF

75.1 KB Created: 2021-10-02 14:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42c27477dee360e5479d19e4d4601319 SHA-1: 0e4fd041731529f2732f6c35ba419a4b3efa5873 SHA-256: cd981420ca8b8433dd1d6cb2fc6fd6f5c58fa7fb262c467179d2ae0b5bf90bda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mh-gartengestaltung.de/userfiles/file/64173346332.pdf In PDF document text
    • https://quangcaowebsite.vn/uploads/files/nepegeneviju.pdfIn PDF document text
    • http://riversedgefm.com/files/file/98683110237.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/89322823058.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/sinasi.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/rotodesivo.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/80530779163.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/dijunovewawawikusofin.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hdvi5j2m0uc0bvnu7r8ghb0ij3/99620007185.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109191250571969.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210930161622.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/revunuba.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/39577476919.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210928_84EACDE62E21433F.pdfIn PDF document text
    • http://cy2hand.com/userfiles/wojadixegapex.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/lugatubewedetirisavetesat.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/sigotupoxiwuwasapufegipo.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/vorimuv.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/visozifotivebotusalimoj.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/26bb852c7b989c21d945fa976956feff/juxevexu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146e4316fdd8---55501919398.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/tololetakuzufopowigisuki.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/medazikunosetademi.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/2367683196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=carrie+underwood+live+how+great+thou+artPDF 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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 19484 bytes
SHA-256: 1b5d5e297e61b25040c5f135e2bfdbb93558fe6c0d3464226792ba1bb59d014b
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10640 bytes
SHA-256: 4843b8cdf2cd5ff81838873c97610ea9b3b652ef62030de44575f484ac3aabaa
font_02_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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