Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eeb671861a928a…

MALICIOUS

PDF

76.7 KB Created: 2021-08-28 10:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9923fd900895368fef9bb3defd30af17 SHA-1: 08be4bb2aabe46e0e6faf7b8d38ad08734e48f1e SHA-256: 37eeb671861a928a9cea179747834eb7f10647effd5b8fc099018aac872cb3f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/klefvicop7k579jh43qbvjjbk3/37317818854.pdf In PDF document text
    • https://curtain.jinware.com/upload/files/dolozegatonadik.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/pamazijekugaselilipafowi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c2d5e8e9---jotewefubiduwokopogolaxis.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/14947795698.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fl59t5p0blhmoia0790ta52uf/zuxemiwoxonigo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/novixo.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/44443013320.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ac603273bcd74b9be0236259079e8df/51869353553.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/pakikomuwilumofeleba.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2f14dcb39a96ee49a8fed55dc9bb01e4/47465448121.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/43618224277.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/roxufesiz.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/55730731900.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/84440742520.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/tixexibedutuwewukabexujev.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/8737284356.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/kabidakisidegibe.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/25627065321.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d400733bf09caa816013159320b18d5e/92543098095.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf858c86a2d---kewaxu.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626372044.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f5aa8b156386fc85db9edb8096ad147/kuxeweboxikigaxun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=structure+of+atom+class+11+notes+pdf+for+neetPDF 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_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 17324 bytes
SHA-256: 85d26fe357443c575d0192e784ecd2b56b62930814db5b6ad4dccd4eeba4435b
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 10916 bytes
SHA-256: 09bacbfd21bf454d6211aa81052623f7bae0cf82a15c46db7246ba82bfe9f2fa

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