Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0d57d24af403b7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 02:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8c2e7fb15b4aa5527174a031f3c091f SHA-1: 0ac9a6c4c9c5c909a236c22620e97f4d7a273b81 SHA-256: eb0d57d24af403b75a84c00516d2fc6d4ddad125ec51493ae0d49210ab2ba9e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83c7e1fa7---debajar.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160748a9539df5---61827242877.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/46154817465.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/regimisofagigupipubesux.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/2626129900.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/q96ct22kqs0fahk9t2s8g2hqk2/38828954087.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/14213204396.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/6088483126.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/977bde7c8bef72c106183f287cc36f48/segetevetaroxovibe.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc1d0a776---vidoxew.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/be4ea514e1be1c1aaaf11505ed9b9a3d/fuzedelumav.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/18409397538.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc4d4db7e9---kebosenekevedirokofa.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xoxir.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zijobipokisafuf.pdfIn PDF document text
    • https://menu2uplus.com/images/file/teloxe.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/qfv853qmak39ljsvgfi8jh6i0t/jalururupoj.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/30923171890.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/fukoriba.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/26309932236.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a91f75330314e3d51a7245a7d3ea50b1/ruvesivamuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=telstra+prepaid+mobile+plans+pdfPDF 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_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 17928 bytes
SHA-256: ea103a60ba165b9409984eb8be91e69d6b563a8a276ab9c07d8f3beca10b70d9
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 10760 bytes
SHA-256: 244bca17bd4781f3132871d1a8d772394bc3ab71d84b0a38f1a5bd8129239869

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