Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf4f69432f8ea64…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 03:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eccc32c2617d478637d786cee0e3ca0f SHA-1: 4c6cb9d0162b34619a99a4746e4f542d258bbc7c SHA-256: 3cf4f69432f8ea6458cc0ae9f0f78234b72573c63c5ff9824fb4a26ca0e0d153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://francoisdaulte.com/ckfinder/userfiles/files/lunuzip.pdf In PDF document text
    • http://imdad-egypt.com/userfiles/file/lofalarogeta.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/tesibaporetapo.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/piganevudo.pdfIn PDF document text
    • https://htchninc.com/d/files/61452248843.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/29712968874.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c8ba75bd7f01d9dd548ee8824d90d5a9/joletotomoka.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e60ba7089---ragokawibopukija.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/mofeludebedunifazel.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/35979365998.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/58760182562.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/nufuvolisitowimuwolemupan.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/pemuk.pdfIn PDF document text
    • http://househouse.it/userfiles/files/besaxagekukidixizutu.pdfIn PDF document text
    • http://napiarsaigh.com/images/35251907841.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139f92ce5f5d---vunutu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bb4331ba9650f9c11f9a3e5abff634f2/ruvowij.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/17638535555.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/memarikarobokuzezorivi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4b9928be342eb5c55e9f104bd47a0985/wosekikubagirulurewu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2de2a140---pobobuzuwebabuto.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/64594794697.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/97705679283.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/80681866610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+star+that+astonished+the+world+pdfPDF 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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 18124 bytes
SHA-256: 5dc2a16e88889a6b782a9d91a7f05dbd2c31c3ae3ee15b8b9ed641c31a4dcbb1
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 10644 bytes
SHA-256: e039992311ee4d54be23428ef4ae8bd40973f5373823d79a559f05f97638c666
font_02_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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