Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f5a66cd1ce4270…

MALICIOUS

PDF

86.5 KB Created: 2021-06-09 12:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 167aaf13d9d30e00cff6749d1fc0ca71 SHA-1: c3e5f957d860b380c10a4ad9d737333cfba9dc35 SHA-256: a3f5a66cd1ce4270073119ff92f2a30de006cefe4fdabc98866ff0f89edd4b5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through malicious links, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=pinoy+ofw+teleserye+replay PDF link annotation
    • http://eau-msu.ru/ckfinder/userfiles/files/38630445533.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abdfd0b91---gokanigiwuvalowubexepixa.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/29865331075.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b560ed4a5fc---bakajuni.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856babd8e47---pajuxigagoxifefata.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/xasopumazozowan.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/132495471231dac54689191fa20c8a6b/60329239410.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/80916400767.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fc8670ae---47257515571.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pipigosivazoxo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nazibojugono.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ca84804653e63151f56cd12b4cdbc8ab/24580816158.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0939a85ffe7b37a114061c7598109e2a/guwegibimegexejutavux.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9144a360a6---79893889576.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/runalesidowekuges.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 5092 bytes
SHA-256: f644ec69bafa518032609592cee69b2eeef87ed7805aca9d143056ef1d3efa43
font_01_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 11580 bytes
SHA-256: 97a72e23d2f08df79d10fdc3bd518f4a8c0b4ba9dbf54437092d7d0c9ab876c5

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