Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ec4053fc2d9deb…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 19:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc9ce1d5e3d30edddf96b86d2e5a7000 SHA-1: cf442e1ae89bb82504dd97a1168f63a184cb2bdf SHA-256: b0ec4053fc2d9deb1826aa5ef9c7ffbd8a51ae7869183ffe8d1698509b040d95
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or further stages of an attack. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0d85ebcc---2852163852.pdf In PDF document text
    • http://mail-business.ru/uploads/file/62155799835.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1eb85d08---mudakisilat.pdfIn PDF document text
    • https://glozor.com/userfiles/file/48307064670.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/72571292268.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/67752858934.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/25278972222.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/83f1f05004cc74bcbce3cf4dd2dff602/pijifazija.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/14788235580.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/sugukefaxevikojasut.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89faae819---10495955163.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uv1t3l0m8qqg08r3i8e9klgqn7/20982247768.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/wesipegewexijesivese.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/zogibesutob.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/tekebila.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/kikupegu.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/55088985430.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/militifosi.pdfIn PDF document text
    • http://dsagco.com/Upload/file/69539754920.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350288bb879---mewaneduwekaruxere.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109061636077217.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/6244636967.pdfIn PDF document text
    • http://www.bash.cl/media/file/lewuxesexijamebaduxurodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=use+android+phone+as+mouse+and+keyboardPDF 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_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 17440 bytes
SHA-256: a68a9db0ab3b2aa119c610dbbe162d346247381c967a5dfb7f5fafcea3e3ac54
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 10968 bytes
SHA-256: 71091a63dad12831c7ba6709c26ede5e3eaed1a523292e5e0676f734cae26c11

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