Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d450bb91e5b40a…

MALICIOUS

PDF

81.9 KB Created: 2021-06-25 16:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3a4e23989f5a0bfa4090feb483c1570c SHA-1: 91fe5689c577bbe92c6eb8797099d9cae437f4b3 SHA-256: f6d450bb91e5b40a54480118f7a62237f84fd0780ff352103b805d273331ac78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=how+to+draw+anime+armor PDF link annotation
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b04252d8ef0f8c9ee968435a7379c534/44448608714.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kozajojokojubu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/58153155165.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/zijamezuwurir.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e42c86ee8---97279421426.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/13399418730.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78600957493.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd03b2c68---rawaguludikadiladevulib.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160967a9bb6219---sedonomirijuz.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/67c66185561ffaa137ba49836d77de77/kaxiwukevojubikida.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e541d561d8---25885392018.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/76301722285.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pigglnhq9aal1o5olnbe381air/12268306383.pdfIn PDF document text
    • http://wenxuezj.com/images/File/54441423635.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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10272 bytes
SHA-256: 47fd4e18216ba277986333ec8c815b4d41c674caf7e0db30cc3da4dae082b614
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 17028 bytes
SHA-256: cc0360650d0e7a436863465a02c4dc27a0b5279ee95c91e85bbf1d1ec0b19511

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