Malicious PDF — malware analysis report

Static analysis result for SHA-256 e824c623b17e9305…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 22:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 318a5fb30537d6f43ac95b2fe695c101 SHA-1: e146f046790f3303bfcc045120b337c1d4b57be4 SHA-256: e824c623b17e93051f21e863db87997cc41a1fe8934bbab8c0b3bcef3dc6bd5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. Heuristics indicate these links are used for SEO manipulation and potentially phishing. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=archer+coc+wiki PDF link annotation
    • http://jessie.vn/images/ckeditor/files/zugewe.pdfIn PDF document text
    • http://irinabailey.com/upload/files/59091210563.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/bonari.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132f15d09237---ragitezekuxipilex.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/78490562703.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/zafuz.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/rivuluv.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61345df4c9323.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613603bd37921---godojikibeberuxax.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4463412217c55a9a17f5f4bb82d46413/zopiwidilufufibuverexoge.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/56818397952.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/wetefidifinewurixikinozit.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6588641e---18828155138.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jifirizozu.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b241822a50df63b51507e644bd9c77f6.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/15965727560.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614448399d607---remubabul.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/nanete.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/toruvogajiwoxoxupidonel.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/josas.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/konovelefawakanusekoxez.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/rarupupivikabusad.pdfIn PDF document text
    • https://lapdonline.org/file/vegapadej.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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 18176 bytes
SHA-256: bf2f7ae5e93667eb2850fdef73559f7643fed19200d9e7e8f71d2e6b93c60794
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 9908 bytes
SHA-256: 998c495c5fb0866336febfa88a5777a4c1c5a764fb8ba883d85675d9420835ec
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.