Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e5bccbb3b1baa7…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e99258a1f4626b1ae85bd16874fd0fcf SHA-1: a8eb2f7bc73060756e619b433ccda4978cde5f2b SHA-256: d4e5bccbb3b1baa72554288e6dca1b4dd08bd3f828a1a05d96159edd4f1d73b4
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The presence of a link farm pointing to compromised WordPress upload storage and numerous other URLs indicates a redirection mechanism, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075849fe70b8---66296979343.pdf In PDF document text
    • http://vngo-cc.vn/cooker/public/files/nufabow.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7e0a3445---49290580592.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/jojusemubaziduzo.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/26928197111.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/wiwajowizudixiziror.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/80243973567.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/51556932037.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4d6d145e5c15a1c69f76d4ea3fd6c85a/feresuwafekeginipigav.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054b92ce72e---2751382199.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q5h7v06p34lq1fm10q1f40e425/50987057064.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/59670377435.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/40478860642.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71574324442.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d39c0c1e4---54128309078.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/30077365923.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160833597af788---60836696518.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/49746001587.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kg9f2hvj9ratbj3odg164i8qs1/nalenozipefozuxenidiwumu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145bf300a9---jafikiziwone.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/0fffviomk7s38tuecfnrcbmh7l/xigumotadifir.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e61b7a271be148cfc0cb6c2a3375a583/88857545589.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/64858987105.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/208b3693c5e4b12be27fe9c42fa9a005/70056929659.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f26a98d150b3bc78751d8ea4fa1a2d26/fufepewegijigubumudope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jumbled+sentences+worksheets+class+10PDF 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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 17144 bytes
SHA-256: 3d2394b2230baa79d4dd469d509f2872fdc05ce95d4f2d4e545e71025e742c2c
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 11124 bytes
SHA-256: 7eca171ab9f6db2a52f83d5541b95e0046550610da66e31af480091296410ec1
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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