Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbeebede646e375…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 00:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e12883353c4bdbbe26d2c3526e1ddb31 SHA-1: 477cadeb00c3a6f19c7b031e66f2fc3625bd1ddc SHA-256: 7dbeebede646e375ebb499e74192f67fa9d786236525a91b8d3f4bb6f4f26d61
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=sonic+e+sega+all+stars+racing+apk PDF link annotation
    • http://boathousebrokerage.com/userfiles/file/42964643547.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/lesuvo.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/niludaramimufarogi.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/lojifatifimovodepo.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/19481200839.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/navovuxibegogodonirumadag.pdfIn PDF document text
    • http://specialcats.nl/media/files/54446011487.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141692a5c66d---joxozomusidenevur.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/23059175560.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/09/50299559346.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/31261334555.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/kevasivazafo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614289ed743a4---39494199315.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/vosulepabu.pdfIn PDF document text
    • http://tayles.com/uploaded/83567436586.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/74527198275.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jovedi.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gesukuxuwapakepot.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/xigobirox.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/62613630364.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/fiweradotosadovuberu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3259735cd---46456289392.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/mukutotusibot.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_off0000bb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB59 10716 bytes
SHA-256: e10dfb4fa0136d244299ffea8c4796ee72c8e0ebf295267f2f902684133b62ef
font_01_sfnt_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 15468 bytes
SHA-256: 4a60436eb1fe62ee2acbe413943c27b7de83d7202cc00a8396a87d527f3acdbe
font_02_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1