Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0aa466b10913d25…

MALICIOUS

PDF

84.4 KB Created: 2021-07-05 22:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ecd99bc3c32a78733f530c831542d3e5 SHA-1: 776f53a667770661c123b688e3a305bb4fdccc13 SHA-256: e0aa466b10913d25230e0e83edb3e56378d2af50c8f327c2c58b9a930d5c0fef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ural-resyrs.ru/data/file/88994612434.pdf In PDF document text
    • https://kodcomputers.ro/2664/uploads/wukagoxiwofuba.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/41881837037.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7474f051378120a694ab446bf75b9d5a/sojol.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070ba2aee480---71118625951.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/7d680fc8b065bc02f52b4372e6c8d1c6/80218369306.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/64885216526.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/37128625262.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/95905780653.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/9603089706.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/89a7c477f44a44be5da6fda978350cea/9841592494.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74932985e---66308750801.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a546b896290---46347117289.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/30821824247.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kawufop.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/pezalokatat.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838830bbd33---tododaneloxasejitum.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/70e10f6bd9caa2b30188a8f7f5f6ed38/8948163265.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/95e0d34477148c49bc9df4c5b7a35d8f/taliwixew.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f3832b0eceae2e736cf1e3d423970290/batanutelegon.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j8t3c0k6tta1k5bj9fh9ale3d4/bikajonu.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/58970673163.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/72189534586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+live+football+tv+euro+for+pcPDF 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 10836 bytes
SHA-256: e796f708e45c17f0620807203ac1dd5e43dfcb38ec52153d91a4219c1b71e145
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 17368 bytes
SHA-256: d85c17734fabe1fdce125985ffa74160057f1149c4dd4125a822eb8f2b05f347
font_02_sfnt_off00012c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1