Malicious PDF — malware analysis report

Static analysis result for SHA-256 6476a5abd956a74f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 16:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96c3e15b845906b0bd4c8a3d93e35fac SHA-1: 54d720e8169939bdcf581e272d1a17ec8b07013f SHA-256: 6476a5abd956a74f3aac7b61148c0812729f91a8c3ea7ec7b2f1681bed9a3c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goldenpeak.it/userfiles/files/xanolexadexe.pdf In PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/91374625954.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/12066117019.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffd14c56d---lalulerinuzuwinexewisosa.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/disevup.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/jumevowuzil.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jiliwiwubidejaxitazokake.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/zulemi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/10814762765.pdfIn PDF document text
    • https://x-software.cz/data/file/luwukezigamekuwokozas.pdfIn PDF document text
    • http://gtshotel.it/images/file/podegoxavelepesejupatonix.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/34597087262.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/67304713862.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/dedus.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/71384860821.pdfIn PDF document text
    • http://strandedtattoo.net/file/95420729044.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/bejufosefonuna.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/senona.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/39939433564.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fibuselizapomexapo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9fafa07eb5b5906c361360a1a9e783d7/27748014785.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zipeleliwobimub.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/68f07794e881931dc4c604d0fb34508d/70340743956.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119552462279---luxojadubilozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=edit+pdf+text+with+bluebeamPDF 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_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 19276 bytes
SHA-256: 8379cbff9361854ad9fd216dc27e2c6227a462137224a72183d2297f18a698f5
font_02_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 10680 bytes
SHA-256: 799f0a6278a2e145bbcf0ff602904d855d29c343352fd376b55b32f68c236493

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