Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa6d0b39e4c5201…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 23:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 046225d9f3eae6a08b78a839e3d12584 SHA-1: 5d06b1031baccf9b78adae557058ef5e1e0dc47b SHA-256: 3fa6d0b39e4c52015a5a28859175d693ddc6ea633f9fe155ab85b66966809bb1
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm and compromised CMS uploads suggests an attempt to obscure the true destination and leverage potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.mueblesgamez.com/ckfinder/userfiles/files/wonijujabewozovovavo.pdf In PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tesesekuneziwumuravobop.pdfIn PDF document text
    • https://proxus.nl/file/94018696708.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/22490381097.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61272702611.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/32363602685.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/diniselixegumiwugedipux.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/97888684334.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/jikebujoguzarojemo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd14c6cbb---fugekapomixikafadawig.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/bozufebuzanut.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/31893149779.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/4788002970.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/58014091911.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e4ccf8241a1de3742c10f8101ddd3856/zuralo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/12015327896.pdfIn PDF document text
    • https://bursac.net/userfiles/file/mafivipoga.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/jewatux.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b9bf2e4d---89093793587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+can+unfrozen+chicken+stay+in+the+fridgePDF 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_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 17708 bytes
SHA-256: 2c241748be34b51775e75af6da218066fc67c29f96fe035ccf08c3edbfacb9ba
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 11200 bytes
SHA-256: 742a92582b27aab72050cc803b98958f8bb20978cca0c9924c2a03905949723a
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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