Malicious PDF — malware analysis report

Static analysis result for SHA-256 6def84af3e46c99a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 14:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97267743c52869cbe38473974ce75ffd SHA-1: ee0f2c9a0bda7455d3b8cd592ee7e67ce2ff4395 SHA-256: 6def84af3e46c99a199d46f1c9a6541617eb0fc73d78a2bb62ee705acee19d76
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://eia-edu.com/userfiles/file/rigosezogewejotaziketij.pdf In PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/19514450808.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8ccc12b6---lobevovor.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/widaxuzinazijiwisiwuv.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/faduvugu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a32e6fc779ce84d2fcd41901525e3dd8/43963172282.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c4a477f19262dc648b0f10dbd9a4239e/kabujinaz.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/24065175772.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/3341333579.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/97912300828.pdfIn PDF document text
    • http://amdind.com/userfiles/file/batelibubuwasaxigepudojux.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/karunofuwusi.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/60492826467.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/kaboraka.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/34886006694.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/18bddc3cfa039d07cae84c707addfd6d/16329521752.pdfIn PDF document text
    • https://puntoagricoltura.it/file/42149374387.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/nigabusujenimo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b7c57909---80778754462.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/pasesonufelal.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/dutesegajewizebevekone.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/60259153468.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abe431866---47248884964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=design+research+in+architecture+an+overview+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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 17376 bytes
SHA-256: 2e9bc9aa6fc5e80688612dd9dd3a4c7d6e7bb5b6f2d9acc4f426b5d20640e925
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 11108 bytes
SHA-256: 63f3f4e3541d36e6a1a50e4332133af679f67ce7209c1d7d57693cad6eee4982
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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