Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23d313977014f7b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 02:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6054ebadb1ee869c3a5b0fcb6cb4c28f SHA-1: 7d6eff9dd6cf9a473080d9729202287f0734d56c SHA-256: c23d313977014f7bb8570402f00b3d4af09162eb7f2d867dfd22ae440968f07d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially leveraging a PDF exploit.

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://ckv-siemreap.org/ckfinder/userfiles/files/36132511666.pdf In PDF document text
    • http://itcck.org/upload/editor/file/dudixexudigidafesoga.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/nobopomixokamemo.pdfIn PDF document text
    • http://agilesolutions.in/uploads/4475573310.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83559516808.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/55308272618.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xasijizeferob.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4c040003---bojewulidegaf.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/lezetenirebojape.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xoxofafawajawanunakilirop.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7l2kdv1j1o87a0fi1p13q0dev5/wikasaniforodipite.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/luxijagapeduvimuxe.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/dexitidoxiwimikopefita.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72058314255.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35a2857a3---lojagekuxojezusawijer.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/dojatifazegezuxor.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/sizilapobugukewivakiru.pdfIn PDF document text
    • https://alpinashop.bg/files/zasonolagimoweza.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/23099351930.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/57545631543.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/dupikod.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/75420f2f4264402b217f25d7a3288a3f/begoxexevubojubuvadukovas.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/82590150899.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/68439291439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=about+turbo+vpn+appPDF 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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 10096 bytes
SHA-256: a1ac84f8724f85a032cbabc4958cc034d474234a82f194bff62fe740d8fdd9dc
font_02_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 17784 bytes
SHA-256: 432fd4e1721d061a9becfe0f327710c6f1fd929036d49c318c75ace2f071eae8

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