Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b7f5e2889fd20c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 08:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f86fdec5c99163352c4def132348981 SHA-1: b5935a38496876e514293b0175859be86c7e28d0 SHA-256: 22b7f5e2889fd20cd123f9f9c8ae3afa48db1ac6dcc0ec665c3116d20dc4b412
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wroclawmodelshow.pl/ckfinder/userfiles/files/27746515331.pdf In PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/14562516589.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/46433309307.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f854bcb355---84049460702.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/9907727639.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/78019429395.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/xizojipudifutemasesivodor.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/90077131921.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawizavesowavawom.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ni7j0dbkvvbcm91t17sdpll8tp/jorazesixewowaziwu.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xiwamavego.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/77862235854.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48444d9f5---labuno.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pujepolimifimaxatasubuxu.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109040503324039.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/sirajoluvekopine.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41979097921.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wuzuxugusoxorop.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333214c2456---80734398582.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/pikak.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a149656e---62136653120.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48790083791.pdfIn PDF document text
    • http://berbun.com/user_img/file/rexasalumegax.pdfIn PDF document text
    • http://roocenter.ru/upload/file/69881727902.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/67509050520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mobdro+for+tv+boxPDF 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_off0000b65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 14476 bytes
SHA-256: 6c8847df8f732b334e7b7bc5d950a3d564418c8aaa52be1b256ce2301161ba8c
font_02_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 9944 bytes
SHA-256: 0574c7d9c17a47f40bd2268d476fb9b8e0a37cc113dec9686c3e87596724c49b

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