Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6639d58b4870e47…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 10:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4ea7a4b71512f61c25f982b00429f25 SHA-1: 4d365661cbe771302e3bb76aea4c269de6826109 SHA-256: b6639d58b4870e47528951e0aac8726d696f6c8dc7aa9cad19577e1538c2c150
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, likely directing users to one of the numerous embedded URLs. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/96341825828.pdf In PDF document text
    • https://sluganarodu.org/userfiles/files/vipelej.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/fufov.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/44423127080.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/71752209197.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092221151771.pdfIn PDF document text
    • https://curvy.tw/upload/files/2239017268.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/55213564324.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/99002137458.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/nizunoleniponunen.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/poworenotada.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142388eca133---18051744662.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/vuxobobewovovuginojem.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/98900661154.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/44186290500.pdfIn PDF document text
    • http://zeci.nl/im/image/43909355618.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/48365026644.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wijavabofexigidobapipaw.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/bevosideta.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/nizuf.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407927ddfa3---5761318679.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/16652365847.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2a09edfc9---49185029558.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/gimulit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=list+of+top+10+largest+countries+in+the+worldPDF 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_off0000af82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF82 11216 bytes
SHA-256: 3f69352ef6a43bd925ec960b4c8d7e32f671cf4275487f37a6ce5c845b5013ac
font_01_sfnt_off0000c99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 13952 bytes
SHA-256: 8bdee3740c9afa8ac8526aa2d84bbc2a2e5acb9a17874c33c6c7b59eba16cbad
font_02_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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