Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd64aa991400680e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 19:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85513e5a078470cab7ebf91b9405fb18 SHA-1: 27043cdd3bff00e8ce63547b1207910a9920d124 SHA-256: dd64aa991400680e08b256cb185e88ad4ecfc05f19d10139eb0a4df141b67865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other unknown hosts, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://munnarinfo.in/userfiles/file/xamalawulikuleb.pdf In PDF document text
    • http://gumberryoleschool.com/clients/33891/File/18328086742.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/19209532726.pdfIn PDF document text
    • https://etadelloro.it/images/file/mexamopopiginabege.pdfIn PDF document text
    • http://nprofit.hk/userfiles/lawavejineverevi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b400ddbb41fa950b1332d79be377b38c/35382327631.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/dunimotusiruxow.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/korm7o8829i2ju9iahg36jbmn1/mumebedaba.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/wuzud.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c652ade01---safiperexe.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/desutovufudovo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fosiguvavuwiso.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/34195636737.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/33210018131.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/50783091153.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/35lcgrrq1mobh5d5vd05vht07o/xomevumovebedapabo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f246f5f4de---24792151717.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579764cd9d---95268246295.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/89547581155.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7njvhg8pueelnvqn4nepflo48l/raxorovupoxo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/j8sqhnp1op2u2besmkjdvd1vps/80580802472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nerolac+colour+shade+card+download+pdfPDF 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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 18476 bytes
SHA-256: 7eb0d037a8f63204d28e8cb863d2565e4dbb26e9431d125b22a52a7e193690e1
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10688 bytes
SHA-256: 05c864630d72654239491a8777474da19e870861af5a7dcf9e0946ec470e29a2
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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