Malicious PDF — malware analysis report

Static analysis result for SHA-256 b467798e4d8d2ab9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 20:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14da449e3f3573c7ef51cbdfe57062f9 SHA-1: bac170d309327bebf747216fdd89468cfd1d82d3 SHA-256: b467798e4d8d2ab9a23097bc195b20fdcdad81184131264c5d25b8811b646c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to potentially compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9003823d8d36fcd35d8156e5b5c7ed14/99156972509.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36093e312---53092322755.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac381a099e5---60094594296.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6adaeda849758d80c74ffdf487e72303/tijufim.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xukasoduxaguzunaw.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210816_012956.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/42092748435.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/nugotozemojevaw.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/54142751603.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/wigejawogu.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160841e0e936e4---gazexoz.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/zobezovidelo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/polesula.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613075341fc7b---39577950748.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/59716326012.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rabaselojifa.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0415a1835---76814108744.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/45261923274.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b8c34d4bfddfd34db3b487ffbc9a210/gomologofom.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/wejopipu.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/13549716746.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82867557271.pdfIn PDF document text
    • http://santabruna.cl/upload/file/74257924501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=family+budget+planner+worksheetPDF 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_off0000bc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC47 15924 bytes
SHA-256: 6f7c149274e7b9de9b4a57f721aa608fda62a89d7c4b8c0a3de0eb7e8ecdcc08
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 11348 bytes
SHA-256: f6b9a5e2982ac749e0a0c2bbd0b0ef17566363c1326ebb4677c4d2ec38aa6da8

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