Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52a4542550bf152…

MALICIOUS

PDF

88.3 KB Created: 2021-09-10 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21bb0449ccd8d31915b2ccf1be7a4b13 SHA-1: 0dd4acb7705787dde57fe2dfce9816f305803188 SHA-256: b52a4542550bf152b234d89b76ca11e6938a5d2a03b40a0ab40bcb7792f2da95
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including one pointing to a WordPress upload directory, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://profstil.az/userfiles/file/gusenabukubupijojapob.pdf In PDF document text
    • http://klenderbio.com/upload/files/34191782750.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/merokasomed.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wonikof.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/nugoxubowasuwefepinuvus.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/62114437412.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/sikabowozazimoredibojej.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130959511ec5---gemerusibidirepitogutir.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/19491652153.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/56986286485.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/mozuba.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/59321758926.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/kexapuzubenen.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/76576ce7b6b5ddc06da146b3a7088c40/zuborujinazeda.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021981925366377.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/92102123395.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/zefixunagusakafejuv.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090522335_590845970.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/dimered.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f233224d82a08d6c185c3eac44b685f8/28391044628.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/79401855930.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/27781471972.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/bizidinafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+drive+movie+online+freePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/funutobifa.pdfIn PDF document text
    • 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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 17628 bytes
SHA-256: 6c3d6fc5e819e347eb55a983baa5a1287f4e5495e2286086dfc832058943cdad
font_02_sfnt_off00013bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC1 10632 bytes
SHA-256: b57182081b3b098cca0aa1075552a812c2d9e3062435d0095822b5e09a81ca72

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