Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b3012177cfb1f0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 20:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57a513219e36f9a78f4fceddefb97183 SHA-1: ddb7b7eaff8a846bee92b70a656934da5ad5fd57 SHA-256: a0b3012177cfb1f0e7e5891c62d1c80fdb86059be1274e24284851fe41b74591
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites, suggesting it's designed to lure users into downloading and executing further malicious content. The 'SE_CLICKFIX' heuristic indicates social engineering tactics instructing users to run commands, which is a common method for delivering second-stage payloads. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=cube+acr+only+records+my+voice PDF link annotation
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135108bed1e8---70851351334.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/86081816082.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/92205179454.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109070352363041.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/jadarogu.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/gutekatizivobesa.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/73622161138.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/30769096985.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/22842131050.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1c439de48b772d86032c69e9686376ab/bibizuxizamadaxu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e26fd2a3d94d89005a9d996334a23ba6/sugekumutafuwuwevafujober.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/54292428084.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/42630163277.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/72074363667.pdfIn PDF document text
    • http://szpk.hu/_user/file/29801533880.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128b1e9920---89719512474.pdfIn PDF document text
    • http://carbonelite.ru/file/nepukasojowofufureletasu.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/togexixiniwava.pdfIn PDF document text
    • http://hflchw.com/upload/file/22365655066.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/26568709613.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6f479fdf---674591879.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/netoxijatitat.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vebijiketorosajezoxusi.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/76266542812.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/59964677040.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/78716222405.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10884 bytes
SHA-256: 962a75e171c748b8b7e52cdae8323fc03f73236a1c64f7a7ffb60fb884d3e3bb
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 17864 bytes
SHA-256: 37f5a440a97e028daa9882cd370ca3140ada93c87b3bc9cfccbf721a03a6416e
font_02_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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