Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3142e2751d37cb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 19:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abe2f7220b902e56105cf3b8f9a0de60 SHA-1: 19ac24704aca13c308df007a680b791ad3e3419a SHA-256: bd3142e2751d37cb0e18a3f77428ef9c1f64e510ce3c88012701528a7a14f61d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=medical+ventilator+system+basics+pdf PDF link annotation
    • http://debden.org/userfiles/file/91076639203.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f702eb1f6---42644298113.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/30577505494.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdf4300fb---90845286061.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/dalalevefilameredapa.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/jusak.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f31c6a1398aa756bd11d7a20e4d262a3/56228644166.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/tadenomeniwanuj.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/29902909842.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/19110468749.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/sokerugijarevegozuliki.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/kuzisevuroxomokidi.pdfIn PDF document text
    • https://maturana.cl/upload/file/vifunozijisafegiwop.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/9028884459.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44bbc8f0d4---86383447438.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/xapenamuwujitugowogukebiv.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/21284094633.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d76494f12e0853a4132c2e3c7a25f3d7/54976252297.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/679365282.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2197bb6fa36efa63f86173720370402/93790235547.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2f8a7dfef5017f86b4395a82a376bc03/nunubelo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0u7u0vq518dfehvv0m01e36ad3/migegorezufagolope.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec16ba0ff6---41949774691.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/94424601290.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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 11096 bytes
SHA-256: 8ca41b274effe4a8338328788b3b57342e86eddc65f555996b4ca04e50d526ba
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 17608 bytes
SHA-256: e502086c20a32e6a5ce34ae335da66d5fb3096a90afcadda942b8e2006c8adf1

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