Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb81ebe0d2bbc2a9…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 05:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9853d2f681b6f0124217235b4311703 SHA-1: a93f8d24ca3e2d93b68a9088631fac6cba4e7cd2 SHA-256: fb81ebe0d2bbc2a9c80e6af9601189e47ee50888ccc736485b85b3e1d73580b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://stillwaiting.org/userfiles/file/zetadunepisutu.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/33125e6b0bacf3e19b3c962d9cf033ae/82835106260.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee523cdc37---66161121700.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/ruramazim.pdfIn PDF document text
    • http://nature-revive.org/files/file/fulaserasokolal.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/72391269712.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088756b4900b---60030123039.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qeqrhbjdrp26nkhkkfi7tg0oto/mataradujo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9614b823a---tesid.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608394602e1d4---goxuluzopew.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4bc47bc2---sivupunopupabomipekosula.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086124c8ebc0---80739885920.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf46cae2c7---milipo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/fozujutele.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/eccfuqg2caoutnmhh9d2in22oh/sunuxogelad.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/67ka6hjb3ojn7k0m62natalbd1/kadabisubidapemurizawa.pdfIn PDF document text
    • http://chineseclothingonline.net/File/molinagubutakedaderipazi.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/43411220814.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296f232c7d---jozimofudadiwininobepixa.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/58484179561.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/xirefizezepedisepigagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=midday+3+digit+todayPDF link annotation
    • 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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 18644 bytes
SHA-256: e2814f87605fcfa7e46b3c7592a03e487793eb610064bfc3f0ecc3619983437d
font_02_sfnt_off00014044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14044 10152 bytes
SHA-256: 72f6a3110cea8d582d77aa1b462e14f7b1750369b6ad3abd2d32cc46e11e5dbb

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