Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce27ec88283711d3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 21:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1f7175bc92df8b72bf5d389a70b5af4 SHA-1: 1fdc923d36204ec7829c38b6a98546ff5b5f4ada SHA-256: ce27ec88283711d3e7fbccaf4c82b802aaeafdb8c746f98a4d68989a50bf9883
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://marlschuz.com/userfiles/files/87949549681.pdf In PDF document text
    • https://coil.hk/upload/files/47890430975.pdfIn PDF document text
    • https://fond.ru/userfiles/file/22539838894.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/68266598606.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/34646994125.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/rikarur.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/73471271161.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/87053783273.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/lamevo.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/bororemonama.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/27659497117.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/9400966687.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/28514826380.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/90407329919.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161364b22a2d3c---18333647422.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/364d8f8d3a358252d9376b331bb21c4b/60366312305.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac86edd0a---62454493186.pdfIn PDF document text
    • http://steinemann-ag.ru/76535657926.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/gegobogitojo.pdfIn PDF document text
    • https://drlanda.hu/user/file/dolavusekasawona.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/xegikobowefoselidub.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/715511490.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/pepepufalekaloniguxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+with+joystick+apkPDF 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_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 18328 bytes
SHA-256: c121b26da05a6f9b0eb696ef15dcfa2b0e3cf7d2197bab6e5db990274c8e33b0
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 11096 bytes
SHA-256: 767d406f4af1a82496db35763d2e90f64668e31d2ae4a7b87e88afcbf0484342
font_02_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1