Malicious PDF — malware analysis report

Static analysis result for SHA-256 84076a070c870a50…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 18:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5a705ab3c8bdc832239d62192220e03 SHA-1: 24fd69e5170c8bb0fcfac103ba28c5640845bce5 SHA-256: 84076a070c870a50861c96074f3473c13360693f36bf0a6bfabfafda51dc6e67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://stealthwindow.tw/uploads/files/202109131731417206.pdf In PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rowatesowumap.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sexaruwuselulemolitiko.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/31511292382.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/69102655052.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee59e85095---42267903070.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/wagigixalumubaniwojoz.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/nevuto.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/kulijofujagakufa.pdfIn PDF document text
    • http://kaies.net/upfiles/file/29912848966.pdfIn PDF document text
    • http://hongdacable.com/d/files/24111508391.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nezijawigerevag.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/6744275723.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/46323667058.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaba5caba0---1877768776.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4343e8ef---70036626361.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/dagaporuvanumegapibud.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64044138600.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/lalutujivejo.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/gukajuku.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/jezamuji.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419f76268f6---dapawozakavesorages.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/gobepinivobifisadove.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8s74umoa91agenoib80dan0bq4/53084640785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+we+check+who+visited+my+profile+on+instagramPDF 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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 11456 bytes
SHA-256: 4c260f080066caa91d9f0cf85b9ef7d6d397a49ee8e0c9cfc800548cc589fd01
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 17348 bytes
SHA-256: bb979955a8793860ccb682f0fa287786d27fbb4028d199ebd0dc39ab4de93f37
font_02_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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