Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed1c9b9c7df8270…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 21:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d273a32a01ed545b849ed8776a640ae9 SHA-1: 81910985450903540d5cc495507e779842e32ff2 SHA-256: aed1c9b9c7df82708d3e25cff852768d8da62e754f719f59af44b6b211ae9626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74eab76ca---jiminejolojatopisetug.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/xemuvabufubujupumivumelu.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219101551519187.pdfIn PDF document text
    • http://potlista.com/file/files/domevulajufoz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6961a4d6e---15107430317.pdfIn PDF document text
    • https://linardi.ru/files/file/81191714822.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/83727848771.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/58495440952.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/98841584194.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60636970765.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/pulukokopemanipiti.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c237f352---lujunuziwubakusin.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/pitaginukujulutomewa.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vesusigatig.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3a888ea0---1501358617.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e6a09aa9d5dfef06380d978410b3f19/mobulobupumuvulu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/06079077ccb967f14da58d6c78419c7d/lotok.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/pozupopaxilazurokibelepo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138304c2858a---rebusujew.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090420525898.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/bufetetanapelululimobez.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/70365892997.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/fobomawixixiwuvev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=street+fighter+mod+apkPDF 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_off0000cf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10796 bytes
SHA-256: 2110128ebe890ca1033e2cd70e3502b8c603a36bd5dad313e406df5a236e1fb9
font_02_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 16472 bytes
SHA-256: 653d01e6fd6f5c1e5e6bb8ad308da21d62dafc2f3a718c05cb88cfbadb1c05b2

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