Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd02b678f2cbead…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 11:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff719778d3e9d586a9c0c39516f70e3a SHA-1: 7bbb40c88845e6369d09d22d7d2d9a0d6577100f SHA-256: fcd02b678f2cbead050da7a2718387653e1bcd49ba1deb7989bf4d9a8aeed18d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting multiple URLs hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of 'utm_term=download' in one URL suggests a lure to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allasclub.com/campannas/file/6202221816.pdf In PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/xuxubok.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/10314513735.pdfIn PDF document text
    • https://kham.vn/userfiles/file/73335305695.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0a62d6a5---dimagagexiv.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8225ee4b---80391083617.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/44516478687.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0c898c8c608537943c80ae4ef4534e6a/77633797448.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/tipabutukakelujuronomuj.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/geramunanavibe.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/51141416289.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/33639402498.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/xinuwapebi.pdfIn PDF document text
    • https://purefeeling8.com/data/file/47182183490.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/rakaduweginiva.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/69535993806.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/73903137915.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/puwugonifatefodenefu.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gusejapatulalelerak.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/bokoxikeke.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/49420788445.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/werususuzisaxexuwakibubow.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xijomujalibukav.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/keworawulirone.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/28603023497.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/26392329780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+bike+unchained+2PDF 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_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 10640 bytes
SHA-256: 6a98430b27e7fac266ffd8d225829fcf6c4e788f76f2e7794f51ea6405dbecca
font_01_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 18212 bytes
SHA-256: c14e27746dcea8a344cbd60942d7becdcaab0179155f63e1c18e698d0fe5bf1d

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