Malicious PDF — malware analysis report

Static analysis result for SHA-256 8629e8483ec4b672…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 16:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63d2f8c817c1ab727eb24d4d79e2e56e SHA-1: 81f959684d06a50a2ba40e4e60ce513e051324ef SHA-256: 8629e8483ec4b672341975a4d46b4ac4b36884c0c3a3d9108a67c0970b108919
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a command-line interface, a common tactic to trick users into executing malicious commands. This behavior, combined with the ML classifier and ClamAV detection, strongly suggests the PDF is designed to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crysiq.ru/uplcv?utm_term=arrow+pointing+right+copy+and+paste PDF link annotation
    • http://hit-air.pro/ckfinder/userfiles/files/89821937459.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/45383471077.pdfIn PDF document text
    • http://rafaelokazakov.com/file/39044651798.pdfIn PDF document text
    • http://snft.ro/media/file/5004653987.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5o9o7d5dvhua2fgloed3fatn95/fewabozenimasoxid.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109060249513506.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/xujodofiv.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/vizisetinonomefikoxiwe.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/wutojagediv.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fotijez.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d8128f448da8f55ff39abcdc2e3af58e/49234925592.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/57010142198.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b503d6e654---fapubu.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/88410346334.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134614d23841---77646928079.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459ee630e07---zudexaj.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137577f5b52f---mumumesid.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/rafik.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/13356291144.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/nonetope.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144223793515---46199637441.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kezefowowaratidimob.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145761a72cf6---punajinazaxekebut.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_off0000cd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD54 10928 bytes
SHA-256: d8aa9582b951e332a34b04faf418e3fca0c01690b5639788894067db00571fb4
font_01_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 22348 bytes
SHA-256: ddaf8abec61c0e034c7c7f2e9e163c5a51a32f30ea989438a76492e07103fbeb
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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