Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c7639d6479f7f…

MALICIOUS

PDF

79.8 KB Created: 2021-08-05 02:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6fd0a850ecbf81b1cf7470647d2dd52 SHA-1: 9ce9283d1daaf3ecedbaee0ad1434748552442e3 SHA-256: 856c7639d6479f7ff540565d28ee174e9950ff8dfdb0f5e94e40d6b1b04de9c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing sites, likely for credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/uplcv?utm_term=centrelink+online+reporting+login PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d28bef0c8---21564829361.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vixozupepa.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/berofajif.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/lapuw.pdfIn PDF document text
    • http://llux.vn/uploads/files/56276195845.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/54466721657.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ac71b3b8---85865617410.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/foziwumukomopun.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/penulatatimepake.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/14ef07956c8ca91abc339ab2d87bb9ed/35648200256.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070937c3fc05---58436713434.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7a6c17fb---purekuxesuguxemiwik.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7599eacc---nezufinulufa.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67162409765.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ef11cbb44a483deab6075dbeeef7fa3c/fimisadazufewut.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/77038463640.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9b77efe3---97261475949.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/55370054996.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/25822373010.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e2b938d8768276c162918d968d664d0d/penoziwujexokutidiwudepa.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2512f50d6600ccdc42334bb4d99ea779/72714156210.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/35136753425.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10220 bytes
SHA-256: 01b4be487a2156147d08b27ac9d30261ef9673f503fa5a913192dc17851c1c25
font_02_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 16748 bytes
SHA-256: da5838339200d136d1c5217a1877291b02b9a0946be0d5dce4ab13c1f38e0a4d

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