Malicious PDF — malware analysis report

Static analysis result for SHA-256 550de433d74e7d1a…

MALICIOUS

PDF

92.1 KB Created: 2021-09-16 00:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f242b3a609f22c08bdd7d7aff67de6a SHA-1: ef73fd578a2c5c82060d4e3f2beca6d7872b2e96 SHA-256: 550de433d74e7d1a11204b8a040e1520c2c07800f5273c1dea824da97b62d446
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via embedded links, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hantechwelding.com/userfiles/file/2021091214104373499.pdf In PDF document text
    • http://www.huntsvillepr.com/files/files/rumoxezexobowiposezema.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mepuzu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/50911629340.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/23956812250.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/56223694609.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/63300774859.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3d419d3fa34dd0aab1ee6f0c66fcc139/gesuvavimezozeponeroxarab.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/85532262976.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf5864d0a---39304474980.pdfIn PDF document text
    • http://sciattella.net/images/file/11547559695.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/94789497690.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4d3ec3c0d9ff1338956a13e22934079a/kumumumixifilulupug.pdfIn PDF document text
    • https://campermagazine.tv/public/file/61005008901.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411c7e61eee---nuxugazirizabirobunakuj.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8688455d3d45d6d229976135adabf0d8/nobaselonobe.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/3179739131.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xanobimotilupovebukos.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/27047516150.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/50017003086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2020+locker+codesPDF link annotation
    • http://irodori.kir.jp/files/file/93234775522.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10144 bytes
SHA-256: f5bfb6b1449f8560269864b2164449c8b2f6c286c6178d26164c134b9d720d26
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 19416 bytes
SHA-256: 8b461ff23802b2d2fc242853842a6bdfb81b6e9f365b2b5df79f27e900bf2961

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