Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e7f45ec1cb54d8…

MALICIOUS

PDF

91.9 KB Created: 2021-08-14 06:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c4e165d01f11f9c8520437e38b57e6f3 SHA-1: 566ba226aedfd8e52f329d7ca058942fb7414807 SHA-256: d9e7f45ec1cb54d8881ac64eac84e73313af9ff2fd2e77105be22df1caa4b9a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607255304ebc8---76537004967.pdf In PDF document text
    • http://freeski.hu/freeski/file/36614478682.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/zeniliduburuvikalexe.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16211107008345.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/tixaxugozuzelosuziso.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/10212291775.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/norafufewovuliw.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/119h01mgd2qr0g5nvtblcf91ri/72235297471.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/nuvus.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ce99c84b5ca4a5902fde3234a1366618/givopifaw.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/43861534057.pdfIn PDF document text
    • http://jiab.net/userData/board/file/61018176653.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3342e4c730---maxonuwazalonaxaxurojej.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210723205201.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed080608f---venonisako.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02786b21d3---pisuripinaliriwe.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/fonosafawegaleloluxegus.pdfIn PDF document text
    • https://ultralloy.net/upload/files/pozonodofiso.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160848b040fc13---tafipurebokasisaken.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/gedufozirokixul.pdfIn PDF document text
    • http://stylekd.ru/files/65300711380.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f529e7954b5---bebemexexuwavepupixololo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459790632d---negofolibibemojaxawagenib.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/tifuwomofezatozilubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+best+uber+super+rare+in+battle+catsPDF 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_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 10584 bytes
SHA-256: 8cd4fc3766ba8b2a84c50a41d9d2193608885f3f8927d7ef577473c804763a79
font_02_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 17868 bytes
SHA-256: 4c3b4ce777925552cec6ff81499d190ff0b619d01b1d22806f662d59cc2796e6