Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dcaf84ef49cd1a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 04:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c30fc56012ccb452e16d9cf5a9419073 SHA-1: 1a8eb15ef7c361282a0b8c2175c014b40e22f0ec SHA-256: b9dcaf84ef49cd1acb60f452a7ab99ad0424bae55da5a2c92d5720e07cb095b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://vinmexindia.com/uploads/21373408315.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///zijavuki.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/56720082143.pdfIn PDF document text
    • https://kaimano.it/file/xupupabexotidobenori.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/4412352479.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/33866091191.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c435f03ddbae4a1e81b69dbb173d2b14/86375472148.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/mibitedonazunerokiwujov.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/jefitudoxitulomote.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d26674302---nazarududipolaf.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/81190907109.pdfIn PDF document text
    • http://ktcz.eu/files/files/27605201966.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210810120011.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512164407684453.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/dc1c1cf76acd6378763fbf3f1eb4aec2/bapomujofodidinowopog.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202179121221383.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b89c0cbea---nabevedijonemimupom.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/lct1qt9arjqt1o3tj3404k5tfd/64951760625.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zuxegisav.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf24df88b---68230077988.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d478852112---7179741974.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5q4u5ah9ogpc4v0lfbmb0b54gv/22973239957.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4dd3294e4---60784455602.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c2b8d5d2---gafebaxusiruvobixabiri.pdfIn PDF document text
    • http://sieuthibds.net/images/files/naraneno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=beautiful+i+love+you+messages+for+herPDF 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_off0000b716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB716 14420 bytes
SHA-256: 37205023cdf6dd0124944b2155bc82e0d5f076bc3cdb96f87c98ba5e6903b859
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10892 bytes
SHA-256: 029deb015d9d01ab6eda3f027906705e74037a270c908eb6987ff8c54cb0f765
font_02_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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