Malicious PDF — malware analysis report

Static analysis result for SHA-256 9303e23403c68bc6…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 17:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 87e5e8da73252ce40281132bf70c9f52 SHA-1: 776392c4940ba6489c8ffd00d48737b72b8b342d SHA-256: 9303e23403c68bc625939de7b70f15f579b8bd8f257595252b65e7591637c36e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence further support a malicious classification. While no scripts were explicitly extracted, the nature of the links and the detection names indicate a likely attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://diversecityuk.com/userfiles/file/dujomalu.pdf In PDF document text
    • http://premiercontractinginc.com/files/file/43221328230.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085048b2d698---kufawusa.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/79480880391.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/nabemidinawak.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff7735506---kulufubivizurupekep.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f5fcd63ec088415ce60f2aaf731b776/62753064345.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39b23e8d2---41708395509.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4rvt9148u881v77g8l8t0beisj/tamepapama.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/444750204fb7018b128283885299ea0d/jibipomomere.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda719450f---63329192540.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607944431c488---buwunibigigila.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/16327726924.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16090638d229b0---48824936168.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074881ec4487---jidebotodema.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c3679a82---jamuwobavirasimiwisusire.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe092e2f5---zivelowar.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gu6jb0qm31ksg0ps8vc0p9p7al/74770707783.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/2204199006.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/jolomeje.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/50766506567.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb0e323909---28265756667.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b18d0f9751e21a691aa710ab1676a6d4/71354923631.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e3278cc1---79950858577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=epitome+definition+englishPDF 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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 17372 bytes
SHA-256: 49805c39cd55d09d7e885bea0f3676262d61f4f228562074fb4d576789b5059b
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10668 bytes
SHA-256: fc43bf67afa4a0c19d691d9afd69272101a4a45eda6a1890f0a9a10d79f473e8