Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c69f9eb64cf6dd…

MALICIOUS

PDF

69.4 KB Created: 2021-06-23 13:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f6533421e53731c3214d0a9e1295f90a SHA-1: 3587e6afbd5272198d881cc22965884d76e961d7 SHA-256: 10c69f9eb64cf6dd4f94f88d9e4439bc9e56bba12f08335acba1c42a2fbd91a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage lure or redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly indicates malicious intent, and the structure aligns with techniques used to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://network-italia.com/file/46596530389.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4c0455e7---folegadepapedube.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53471c5a1---14573585637.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/gebavozaridakidom.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v7ffcp53kfko3fr4fpesm0bari/fexubabafarit.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/57340405055.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/wuwovaxekimog.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8236ce3ebeea84d8313f85051d45695f/24988355541.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/78216858147.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pisusixinakezewib.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/gusegufedazexoliv.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/13852998352.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899d7aceb5e---70151881012.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a626dc87---gibevifewibajitevobuga.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/dff4ae4c3271355f1adad2e217ab4189/minedon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=answers+in+genesis+storePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 4692 bytes
SHA-256: 102f43bde4fc7eee5bb08a6273b95e8fbe2045f2761e5c0431252a00e99355f6
font_01_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 11364 bytes
SHA-256: 116652d1365f018c97698830b423e902a7b682bb2cc277cddfbe4437554d10a5

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