Malicious PDF — malware analysis report

Static analysis result for SHA-256 66372fac0f33f9b8…

MALICIOUS

PDF

95.4 KB Created: 2021-07-03 04:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb90bdc1b22f8a038d8f5897fe24f4bc SHA-1: e5542d082d164b5927d85556c20fea4f263b1592 SHA-256: 66372fac0f33f9b854481ab8cab2f5cc5d61aeb1e3edec9ee95394e22aa1890f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and a high number of links per host. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, many pointing to compromised CMS upload directories, suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dalnoboy.com/data/filestorage/upload/files/36147398221.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3141fef66c---5838995039.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b9d4007ad34374c14445018816c350d6/283898180.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/414e4df58eb95450b89a2bc18acda482/96013370614.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/33534885752.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gebaxoxosebogodixafun.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b9a68e2c---kubijimepodiwelifetoboku.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/86735051035.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gobufilivoxab.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23be939416---21718947067.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d428fca4---katofigagiva.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/jogirulezawuwe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c612d244abc---97692885389.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4ea8f858b1c43a2053d43e27d49ef7f3/mikigabipizus.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9b5777637508e56fd97bbec20a8e442b/nunedumife.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbea9e75a0---jeletedunenebatexamaboj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c5e464bc6398103e937eb5bd099b5cb/47675025173.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075f4ae510---62917903386.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/38101052975.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ksr80bjoluqrrpcfrc64s8lthe/88911062208.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc52f14f6f---diwerufokikediv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+lion+king+special+edition+the+lion+kingPDF 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_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 18364 bytes
SHA-256: 4baa829d7e143f3742246c2acc406178c533b4828885982e5378932242c9737e
font_02_sfnt_off000155f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F9 10748 bytes
SHA-256: 2b9ee3be675252e6ff1543c99c26c3fc27fc8b1bf0ab18fb58477c3fd3fc587e

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