Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b4985e563c2801…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 15:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 670f02647a12606de8b94daeea65f6cf SHA-1: c34387eff2283a34c54d8460e7aa9e96b21be12a SHA-256: f5b4985e563c2801efbf72ffc8bd1b34d956a35ab0bda6ea8316b4f1e11badf8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of numerous URLs suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=hp+dl380+g5+user+manual PDF link annotation
    • http://vstarmp.cn/upload/files/20210617_192357.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c965c33ebca691e4e1ad895ffdee5c4c/22154151795.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b594896cb---86763925781.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/69136825909.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210710_040548.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/98340069917.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/gulefosalenibovibotixup.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f2302837c7dd980f44d76417b24538a8/98301648850.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608873e72fc24---98630711742.pdfIn PDF document text
    • https://wsbtitan.com/images/file/8069482719.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/1053913033.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wexebaf.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/vuzedolofunem.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/32417458310.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a2c4549c0---31553157102.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/537e606ef922701aeebdf4cda81ebd76/48591691640.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161304cff8396a---gelija.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210830054907.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/42196d6852eaf44eb114846a33524bff/motomaxapazigujigow.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d0b83d07e---73955336810.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a936927dd16605be69ef2bce19bc335c/mowukapibuxelomumotidaziw.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/22562080154.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/kerazu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3ffd32a619a3e5dbb00f07c0cbe7c6f2/wamotatowules.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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 18120 bytes
SHA-256: de9305e8d282a43bf8ae5e582700dee035faa837c86cff5651a6d891ae111780
font_02_sfnt_off000127f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 11152 bytes
SHA-256: 093635f44a9f9b1715e5aa9e962fb7cb8248252d3c13722018db8a846b017d0f

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