Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95bc0298b03a054…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 02:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7930043f5cafedb99d871640bdda51d9 SHA-1: 92c843aa78a65d9085c8f85a79df0ff93e1ff7fa SHA-256: c95bc0298b03a054570dcd09a352e3e09568ff17262edf7c6391ba16dc18e131
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://investbuild.ru/var/upload/file/23204812104.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wosetaxelimobetobag.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abff3bf0e4e---furebotodudijakasemimokew.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adfcb5498---wolafapomat.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/lusoludediramazorasajer.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/tugofofopopojiguwudesi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/74385011786.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/ramawonuwomutap.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/20422132408.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/98336289796.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/kojobenafemebofikopuko.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/zazoxegadolukapuvadu.pdfIn PDF document text
    • http://faradbox.pl/files/file/27612233517.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/kemakepefenejamalup.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/706h43ihjc929lo8l70mi8or5u/povivu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6fbed17356787a7b1d747f95ec20a51/59371916840.pdfIn PDF document text
    • http://sam-global.info/files/file/lagosedakonezezemo.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/xorepupujutijemunazakob.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73342d7c0---wadofagojelu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610057e351a8d---23895256769.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/9761366100.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/sakosisopasavudi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22c151e13---94063311311.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/fizapewivedareturokez.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a573ba7f3---zalorefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ridiculousness+elle+kingPDF 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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 17752 bytes
SHA-256: d254ec45b107a9047dc3c758bf8dee4027a7f10ff185cc58e300870ef6b6a988
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10424 bytes
SHA-256: 94e5da42cb19f14290d9b370265895b7e01351b266cb8562d62d5cd44c4cff66
font_02_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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