Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2f33b95621a78c…

MALICIOUS

PDF

125.1 KB Created: 2021-08-16 15:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 475a7b716b895d04d168ac3a92cb5b60 SHA-1: 37b0a6cc8e6e770404b5b530cc2b72db10b3b9a8 SHA-256: 7e2f33b95621a78c5c49ed0361999ee05cefee1eb1f69dd3be4daf4d42a6193b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 websites and disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kimbuunguyen.com/uploads/userfiles/file/49750096185.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/31157490991.pdfIn PDF document text
    • https://bnovum.hu/downloads/kodokupujegalopi.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/13834530827.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/katejexigixinaju.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609845bd55c08---64145844260.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8ko4b8qcc4vhlj5svphtsednoi/3612639592.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32dcba240---kerafiz.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097aaca218ea---99914055899.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c33f0199---jozunotezanesomivagibax.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/pejik.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c539d8128---77735760682.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6mnkldqchnm2ep170gec24r40b/borezakemepiberinusesufi.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/vufibarufegajiwusuzer.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/zafolarobu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/70730773970.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddfea99f2---26993832072.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/82831044018.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sbo9citc2j47a86c15o22la7d9/kosukiwamaluf.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nogexalo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5af6e43226---91589460055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=integrated+mathematics+volume+1+answers+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_off0001840f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1840F 11320 bytes
SHA-256: c45506726e5751880aecd67f129815d5707e51c59c9236822ea544ecdc9545e1
font_01_sfnt_off00019e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E5D 17332 bytes
SHA-256: 5bdfb2c32b64a2ea025020d25da5cf8c03b2f93c06562e7ee15b9416d59a65a8
font_02_sfnt_off0001cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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