Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b73e8fe258e448c…

MALICIOUS

PDF

76.8 KB Created: 2021-06-25 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 103c325994952be78ac81ae4f123b522 SHA-1: 4f05437d4cec248a89f0aa9e9d0e9904442b2724 SHA-256: 6b73e8fe258e448c9be429057817380985ff972bf1aee3abba19d84e882daa70
176 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ig1lausoqmr5fc2bp8kj4ir910/xunopedafinivumuvulozupom.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/05eb18b47ef01b9c571e5c3c2bba1b86/mowoka.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b861038e69---rawurenakisoj.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3gpfh1dkn1h9maim51g7g6rft2/bibulenonafoboge.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609280d529753---xibepogexinuvofebuben.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/726f1ca91ec82707773d0ccf4870f2e2/32824035451.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/duruwifamemavozanodosopo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xipomiretulinufudefeloke.pdfIn PDF document text
    • http://ciskmv.com/css/file/97624525343.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/10c04d5e8c5eb4ca2f3fca98c682258b/27790731461.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xekowosobunete.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/jesejupuxagetod.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rafinemufofineroparu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/kenavowafuvapat.pdfPDF link annotation
    • http://canvangdientu.com/images/file/93569887862.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/6748212435.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/94514705552.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/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=excel+dt9205a+manualPDF 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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5392 bytes
SHA-256: 0fb3ba833f8c521283c5a80e3d8cc299b21f993d4f57f4643bd7286732c9e3a3
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 11944 bytes
SHA-256: ea0e0c6804d3e94daabfbd43850f2c77839c4c632308cf38bb03333b75438640