Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ea5b56577b75ae…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 22:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c42946dfb830f6a6a4161b041aefb09a SHA-1: 1eeebb85abc343568200ad7b350209a51160f90b SHA-256: 85ea5b56577b75ae7bed71dc7014d38ced624a5a3869fa549533342357a20934
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a raw IP address, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://unitedfightalliance.com/ckfinder/userfiles/files/penagovujarumonifavuzijo.pdf In PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9a9fbae9597df71ef73169cc838c286e/73590737173.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/movokenezoxam.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210805235352.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524045054910285.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fa7ca230b4d1106d7b1b4e8b5c8a3acb/xalojebiwimaxuv.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa6d685d4---21713442161.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/25411121312.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3701d12bed2a82019d663faf69c4d832/78552626606.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/76257926801.pdfPDF link annotation
    • https://dichvumayphoto.vn/webroot/img/files/xijomoju.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/vodibakuwotaviw.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3d78be5df3fe2c8c24347fa22963f8cf/kemeb.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/joduzine.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7811e8c4---45875964383.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/71954251336.pdfIn PDF document text
    • http://novichiha.ru/pic/file/42139317370.pdfIn PDF document text
    • https://fobh.net/userfiles/files/gopirutesopujafonutaluv.pdfIn PDF document text
    • http://davobio.com/upload/files/54097716938.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/nivinepomot.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/vopaxowowimodidikujage.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p30tu65nsh18mnsel1m1jgr4ub/pikojutugatine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bellanca+viking+maintenance+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://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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 16716 bytes
SHA-256: 4c92d8e555593ae49841b0929d227aa53783a919fea32247a9f9d641067b22f9
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10496 bytes
SHA-256: f6f5e79b59e39a86ee0d6307a7d04f42be8282dd95634aa1f131ed5db14ca5ef

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