Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad7c3d1b3132579…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 21:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 395784bb0d5d49df789eb7397dc01ee3 SHA-1: 6f4337b97d5b8edd5e4fc6c2ed106e5f0f8537bc SHA-256: 8ad7c3d1b3132579de8f26aabcfea4e33bce8a55b70c6a5cd9cf9a5e8a26428b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of distributing malicious content through link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=among+us+3d+for+android PDF link annotation
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xosegiwegorosuji.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/fufibifodaw.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/duvofakesikimaw.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd845bf4b5---71762476884.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/zenakozenijiwobeb.pdfIn PDF document text
    • http://rapet.hu/files/febapenukak.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/77461655430.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/jakizanuja.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/71028197818.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/sunivafuzimesezi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a80000da---fidujogojurod.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/menuzuvaluwoluxilunajinir.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/zasuwuk.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/25518516738.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613847adaf12f---36043322410.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/92934400088.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/47813727303.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/31076573877.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/gitadekurojitelaxipe.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/92195056974.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/jigulalo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613825c377882---70466795258.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630815024.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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 14844 bytes
SHA-256: 6e55ed9f80f4b33be59a0bd9cd50fc7938911ec75bdf9f7b029b05109f3f100b
font_01_sfnt_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10672 bytes
SHA-256: fc9f7acb77d5c6e88bc2160b3a4699cfe568ce2f5b1a43c648dd4ff7b6a70ee4

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