Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d55b1c6308bede…

MALICIOUS

PDF

89.9 KB Created: 2021-09-08 16:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2775ccd75a9fcf7b6af4ec7922046b08 SHA-1: 6d3536cbaf887ecd64ac99d2bea09debcd20e2ad SHA-256: 92d55b1c6308bede35e795fcca1312da732faf0ddefa907adf48ec012ab89ebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://naveenent.com/administrator/imagetemp/file/75774468093.pdf In PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/12142416098.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/82659512174.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/73265616632.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/fuburuwadalegofilinoxup.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/94174887039.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/lonoronawobujorevigekufe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136440de5e40---gidiledegibepanozo.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/sazulomufunofeguperagun.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/fikelugevofikobejizeke.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/fizewutusijofuxeletil.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa9925904---mejusajovanefikelu.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/mopus.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/51716792708.pdfIn PDF document text
    • http://eichler-kammerer.de/62907613463.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/pifukasajuvena.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/19196609897.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/64337710327.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/91532146409.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/13272204230.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe4e65696---jodorixuvojemelaxaludel.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/faweregenibibajefetub.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/vupigibuzajan.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuxavusoxuwazoloxawiris.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f695b499c4---26750958744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tree+diagram+without+replacement+worksheet+tesPDF 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_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 11200 bytes
SHA-256: 0bf476366823c29c4377c19fa90ee6e880100005b5612e4493f8263fc0348f53
font_01_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 18336 bytes
SHA-256: 1aa6c35b736d5404f7701d9b9114e876344ffeec2628392f6167ac02187a135b
font_02_sfnt_off00014217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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