Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee2d5c644d66d01…

MALICIOUS

PDF

95.8 KB Created: 2021-08-31 05:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dec3719b39a191bbd3f4de2911808ea4 SHA-1: 035a7951705f39dc979f0de518dbbb38f0126809 SHA-256: 1ee2d5c644d66d01b07cb0970c64f616a295389ddfdfb823c9e88413ef087baa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple links on potentially compromised infrastructure suggests a link farm designed to distribute malicious payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de98d7223c---46457264666.pdf In PDF document text
    • http://www.biotanika.pl/upload/file/pexeset.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddc31ef7d---34480590925.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ea94108e---dibozovugoxixe.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/ditawosimigubos.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/43962415191.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/84798946244.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16108dac376039---8475115735.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3224061eaa9ee94b5a4d7aa8abda1313/xasimejipuselodu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wizupiwajukip.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/tikazanujutipolimetefe.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/56414238665.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/17619123493.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108230816481257.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a27496b8e37---62197973940.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608307d2eb687---71338178162.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaef8d5d42---vivexuxevotomevap.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/46924901370.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/75504149197.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/35da4a4f7f5c549f6071640a19a0d1f3/gelanejobidedasamud.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e136eb776---ripijox.pdfIn PDF document text
    • http://m2m2design.com/userfiles/68662760229.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/vavoxotaxewebewul.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/xizazosanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=frozen+christmas+colouring+pagesPDF 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_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10956 bytes
SHA-256: 1482d9ab3f39debde07cbe235d041fb5508ebe10c9f90151bcd691d80d8239a9
font_01_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 18848 bytes
SHA-256: 71b3c64ef8eb672a988da67b100d7b4b103ff055f847705d1a207d2ec9f8cdf4
font_02_sfnt_off000156fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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