Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd68ca81f490da97…

MALICIOUS

PDF

103.9 KB Created: 2021-08-20 10:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e75f32afe8be08c2068e6a859a72f6a4 SHA-1: 4c03aea7c3c6f99366056d7a0bf019ecfe412769 SHA-256: fd68ca81f490da97396a8c8b06ff9a777d8b6170381af2481d4200c2086d4446
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c7ca1eab9---15413744782.pdf In PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/weboxotu.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/85197118811.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/00993ed3b0eb3fc6049b993b2816bb94/49514856628.pdfIn PDF document text
    • https://termoformat.md/img/files/35793127582.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9cda9f3bf---56007670922.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d54506f2be4---gememi.pdfIn PDF document text
    • http://retailcop.ca/files/29081848764.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e3d3d986---budoz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75b4ff7eddc9d66590d1a0ab6329a4a5/72267414566.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bc51f2d4---9924430818.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/lerapapufed.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/15502173515.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zutejesawofijilibefedewuj.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/41180998288.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb6b13e74eb3b79b820e222e3fd24fb2/49393867839.pdfIn PDF document text
    • http://iviltra.lt/images/files/wowujinunejekoguki.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/79930391588.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/dca99a814ef7079d5edc68e688e64d7d/7249636711.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/33850858299.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/lovorutidanop.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/wemogobos.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feca23562d---84226702236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=correction+manuel+physique+terminale+s+hatierPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 16188 bytes
SHA-256: 85fce69cb907e78cc3814ae243d34d9e2ebb223946f5164e744060a7bcd0e73b
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 20324 bytes
SHA-256: 4f0c9113fdf0f56cd879ccd95c8be734919329d69352c78743cffab36041a88b
font_02_sfnt_off00015c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C75 11028 bytes
SHA-256: ed7a46b880adedb09f0ec91c4583bd5ff072e7fb0e3a784c6ce05996125c0fb2
font_03_sfnt_off000175f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1