Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d11c86e4bd68f2…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 06:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3d807fe1f47d6f145d3d0b05abd13b8 SHA-1: c12a02d6efc84bd975c335e9c4d7c0dc092c652d SHA-256: 13d11c86e4bd68f2371a63d4d20d75d6a3f95be4f9b8a14caa8edf10a1735a6a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external websites, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://juhaszautovill.hu/userfiles/file/bumuzubupewalakevorasovef.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815cd1e4383---58541742618.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/notolu.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/nofalirovovulopilekuro.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/70728315880.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/81535185350.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/63528165442.pdfIn PDF document text
    • http://sdds.be/userfiles/file/92400627631.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f2e5c335---48852836104.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/79665480243.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/43120355207.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/42892206fb0093b24ca70b652e8df0a4/renevipofefoxegexumebaj.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a003e91c7---jivugaluvajojilopezojuw.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/612dc114c39849b6f45fd743ed595cec/79158767756.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/73182694994.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/83476077515.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117a15d1cc87---wubazuvulopukinigudonexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=differentiated+instructional+strategies+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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 17696 bytes
SHA-256: 959edebc134f1bb79fb7ebd16db6e2b8e32647d836ca6b6c7d6ca6abbab24ae6
font_01_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A73 10896 bytes
SHA-256: 0e761229d993b36a041f51b2d7cf1231a4acb9090c1d06b4ce9cb16589e80c0c

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