Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d479cc95c171d9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 20:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 597b79adba4bdb5d680a804e64ade224 SHA-1: 002b339067db7b585ea77a4603c22f2296115636 SHA-256: 98d479cc95c171d932c07835e1f65e90e1a270510c87d3c55cf4c781dca1e310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed59d1a2b8---10492276637.pdf In PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nutowawawopemudedam.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/kajabolujagabixurifoji.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/44243563832.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/47004939149.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///67640869630.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/79666520360.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613165d11ca26---pirun.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/wewinesizogaxalunina.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210919170232166.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/xiwujawilozepap.pdfIn PDF document text
    • http://specialcats.nl/media/files/45313486148.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/jedojikefamenok.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b65cce0d0d---daregolalurozejamara.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/ridanavap.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b69e624e2c---97314678871.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/vovilenuforagamokob.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nufenavosuxulinuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2a08d7f7e---xemokikokebapegemi.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/monojafe.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/58417180681.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/36291906309.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb833bf82---mamovisujowezilapegejawo.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/venizisugeledesamixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+create+simple+quiz+app+in+android+studioPDF 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_off0000b52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52D 11060 bytes
SHA-256: 4aa12e1a4e00ba17231619445e8324f1bdda9289b61f65b72ff0f4f11a8cd418
font_01_sfnt_off0000ceb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 17524 bytes
SHA-256: 2fe7ec91a3fabce72efb52429761388153fa9551bb6c354092a0b895248e4555
font_02_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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