Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dafbc34fdc77d2…

MALICIOUS

PDF

93.1 KB Created: 2021-09-14 02:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3a55827057d31162336ed5532cf1b6c SHA-1: 96a0ba96364cba4741f183f9de3aea6be7628303 SHA-256: c6dafbc34fdc77d2dfd2124b19d9ec7086ba22bdf5f7dcc1e46b37d55fdf568e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely to phish for credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gloriamus.org/Uploads/userfiles/files/33672599955.pdf In PDF document text
    • http://smeeing.com/userfiles/files/soxevubexumigixetuku.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/bekutovej.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/44011150063.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e88ced84264ee9ee69bcbdb6ecb0eff2/42383091779.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338f573fccb---zofoberuwadolofivagebabe.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodexepurike.pdfIn PDF document text
    • http://castel.lu/userfiles/files/20800577700.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0bfe0483d4321617053a07e49d553a06/11003626789.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910234748696.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/pajatupunonikavu.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/96885629468.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/48540459124.pdfIn PDF document text
    • http://szm.hu/userfiles/file/50103817773.pdfIn PDF document text
    • http://esteel.my/userfiles/file/73109786997.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/57114633182.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/79669631777.pdfIn PDF document text
    • http://sun-eko.eu/files/file/botit.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/7910723149.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/94876916161.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/piwag.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/davevupumidemokini.pdfIn PDF document text
    • http://frchem.cn/upload/files/xonaxa.pdfIn PDF document text
    • https://birudongker.com/contents/files/rupewimijuxojaj.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/rizunipesazigugaxawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=drm+azw+to+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_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 18320 bytes
SHA-256: 7c10a993b60d0fbaf4c6354ecce4ded023bdfced59473b0239641ce649049d00
font_01_sfnt_off000137bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD4 10264 bytes
SHA-256: 4a7062f227499bb48aa4c19724ae809c03b435db2c8d3d79c34e0e9bd83e50ce

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