Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecbb2242ab6d9bb…

MALICIOUS

PDF

102.2 KB Created: 2021-09-03 05:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac0297e04b2dea50b456f9e5b08353db SHA-1: fc85674c424bafddb738e365c8e4f53d7c622718 SHA-256: 8ecbb2242ab6d9bba07d9a744b243d65398c7847202518e8e96061fee296a2e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tptr3pk9s94ajt2euhii16vvah/todizukanu.pdf In PDF document text
    • https://perfecthospital.net/FCKeditor/file/4759575266.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/83b8b46ac987b73615c038354f507766/wovipukotibomulefaxav.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e17eadc004e---danigabiwafukivivuwegis.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zijuw.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/godox.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4166190d10---77258010398.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/29958590716.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8f84f3a37---kananapafejexinomegefawu.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/8406904382.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2e3150aac---wimesoxaginesidob.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c50b5793---bukivogixawolumadopibof.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/88999647965.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50823585110.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e2c1330e---dinobomanusijisor.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210811155126.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba48010f97a---90072161190.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850176a458f---10896753994.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/degutuxomogarir.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/zarefi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kl2sa4nluc3n3l295k9evfrsik/38892349532.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/putepi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57c572c87ec7b702c453a18d30978b44/vimanufes.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/ragadimapigebit.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/93602417818.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6b18ac9f4---konotamamunofenup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=immanuel+wallerstein+world+systems+theory+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_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 17752 bytes
SHA-256: f6fb2ff4e4c39d49548dff1e9a730def20f7cfc7ce9d38235112156340218a4a
font_01_sfnt_off00015923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15923 11016 bytes
SHA-256: 2ed633dd2c8b9142c01352972f180508f90fd321fd24181801e3da875fb6e6ff
font_02_sfnt_off00017294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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