Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fd005e342e964e…

MALICIOUS

PDF

92.2 KB Created: 2021-08-13 12:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86f747076601c84c05550c5caab60f83 SHA-1: 4e63a44875698431600fb2f1313d759d64978f51 SHA-256: 66fd005e342e964e5851b3b79bb4bc96664e38e51d5ad494cce705c837fda85f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://irlanc.ru/uplcv?utm_term=o+que+%C3%A9+uma+raiz+quadrada+exata PDF link annotation
    • http://sahrugs.com/userfiles/file/63604261098.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/19512407330.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d42e656e3411f5a1c00917aafbfe4429/5221278611.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1b37913e8a963141eef2fb875907ec9/nuvinuwefob.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/maliwudabiba.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/fukopaxipalu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/363c0c757b7af83d099e5fb55f27d6bc/90110384846.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec9f1263d719e8983606e21e59ed8e19/64546904993.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/woseramadapuzuna.pdfIn PDF document text
    • https://purefeeling8.com/data/file/13784894650.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c906010d261---garalegiwidugivujixi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e229372b4---72661061231.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a561c1fa---44391602896.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/85446942244.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4gmnutimh9jgfj1n88hl7pjoq3/jagenudol.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/68686160544.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/36524867939.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b380ac118036a50c8fd7fc33bda07092/51786271183.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04b9f314da---80100194600.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/sewikejirupi.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021072806525673499.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/6750890777.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/82228a4bdb4e89c6769a976c56a00fd1/nupixikuzomakixotezolorap.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 18776 bytes
SHA-256: 64e6306d0d17365193f5e1c46e93f2a9a8415ed95974f32d986c48df7d0c324e
font_02_sfnt_off00013293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13293 10556 bytes
SHA-256: 1f187e75768c5b851a60b22e799422b04b23e065906ecd6efc280351955f3514
font_03_sfnt_off00014a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A33 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838

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