Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf0724b4a7fe8a5…

MALICIOUS

PDF

102.6 KB Created: 2021-07-02 23:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11b0f7129b9ccc879bba3fa0bb5d0171 SHA-1: 8b54caecdc2d66d66a14e1663d3a030187a509c3 SHA-256: ecf0724b4a7fe8a51369485d2f90796f733c232c0aacdb66d920dcc5cb8a9ff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous unknown websites, a common tactic for phishing or distributing further malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL findings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://k-yoga.org/file_upload/spaw_upload/file/20210525043259.pdf In PDF document text
    • http://linklandhotels.com/upfile/editor/files/bogupozekunebagokulap.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/pofevozozemezosin.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2386871ff68c941fed9eb39b34f513c1/59432799006.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7d8223b36adf7ce2a2e53507a3a76f6/72407755198.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/mawagumu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8qjsi4tq68f95kctcmfrgfm9ib/15315681740.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/sajonutidabi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756d0c2396---kubupedose.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ec1af380---kipokad.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2144784e8---17285160207.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/14828955.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d3821677a7f0c0e6045ead15c284b738/wowemi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160796fd5ad49b---34006222026.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495839ec8b---44007052174.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa9ac60368b80fdafe03d6ca3fab6015/68400311989.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/vijepev.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/98938068574.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/worunavorazavoxajizonajal.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/898b620748b0c64eca484e226e76e355/rilujefupezetidufulop.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b04595e3b---94472192159.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8f0b89f2dea7a87ac585d8fb8bf2cd45/10924775640.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5a8d4a47ccf53fe02654f555232ca3f6/luguto.pdfIn PDF document text
    • http://kme-kme.cz/files/file/kedawiradusuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=national+fire+code+of+canada+2015+pdf+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 17164 bytes
SHA-256: d26b5ba8b16dde5e51a356362318f1a9a895a64f5c2713cb861fc9594f0b35dc
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 10936 bytes
SHA-256: 28f74df44d2c061aca3dca3d20af9014f10e4383741b35c514bcfdeea318555e
font_02_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 23020 bytes
SHA-256: aa9a8fe00b63e3a89c5b0de7c11dc8259aa566589f275003b8bfbd9f845ee958
font_03_sfnt_off00016877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18084 2644 bytes
SHA-256: e48736443b77a5ceed3175884a057bef196bfe6994752685b9029397e35a543c

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