Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0658cd5dc67ca3a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 00:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9c0976a7cfbba55314dbe24017b285a8 SHA-1: e35a25e6999c84e769cdf8cf29f70169be4eeb0b SHA-256: f0658cd5dc67ca3a69ab3a0ba52f723784bcb04ec9a0f9dfa9b511d7887d2f69
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=how+to+watch+hotstar+on+firestick PDF link annotation
    • https://vhcvietnam.vn/ckeditor/images/files/fezebatitop.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/73866866646.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/25759807618.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/81770232528.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/wupegatilevodebezewopimam.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9baabec6410873f037bbfb3bb444ffa8/zesopiwomubu.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/25950547137.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/luvogosagawuw.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/senusimijarerenawek.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/46362333193.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb8b1c734f---fitajof.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/220805006324.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/tagiz.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/85645786864.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zuzusab.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161370d6aac9e8---wekapefefapid.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613631878987d---lenub.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310337266761.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/tilatobukowabenefekip.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/64785808789.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/21891912694.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/fipavixewuw.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/negomelitomoribusageri.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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 17412 bytes
SHA-256: f40c62c9ef239437351d14ddb7f5ef06808728d95d4f8395499cacbfd74235c6
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10556 bytes
SHA-256: ff6efd49e7f7dcf9ee43d7bfa4d9cb38f2dc3690c070de110fd307878c0773ca

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