Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59edcc54d2c3a23…

MALICIOUS

PDF

196.1 KB Created: 2021-09-04 11:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1daaa7466dda464b13d1b521ab79e73f SHA-1: 9e492117b0d292cc72cc3b1874cd80a3cd1c61e1 SHA-256: f59edcc54d2c3a23315a00460698544ac6000ce455b62ce276add0c052d7090d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, with heuristics indicating it uses a link farm pointing to compromised CMS upload storage. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into taking an action, likely related to payment or an invoice. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9801

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://transturist.ba/ckeditor/ckfinder/files/files/20555471991.pdf In PDF document text
    • https://chp-travel.ir/data/file/49722904916.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/vikolup.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/2829566571.pdfIn PDF document text
    • http://mqskin.com/luutru/files/dugufeva.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/99f28916bf856b1a34b749995f8699c5/78489741781.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6beba08bb---72044697026.pdfIn PDF document text
    • https://netpage.info/userfiles/file/82508996414.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/rumewebifewiredazolezi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce44e2f4c0---gawejabatopexaxigome.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/zujifakerilowow.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/2158198326.pdfIn PDF document text
    • https://2winit.com/Files/files/fegozumukowuka.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hso6g8mru7du6ngia9i999a0g0/73272717696.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/gexuluke.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/bewenawekorokuxezulerulid.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/39125298161.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/deruginowiren.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zutabepixusi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/95b3b4fea42958688fd8c1b87c6723dd/zaguxixesenafa.pdfIn PDF document text
    • https://langumeistras.lt/i/File/dizididejukut.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757abcb7b61---nolozuvabe.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/27562803842.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/28081442113.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/lunavejelokududumabu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95808624879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=oracle+r12+order+management+user+guide+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_off00029c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C1E 11260 bytes
SHA-256: 9fbc896ec2886123ce8f3c9516a41e8b76098276f280bd69fc1f177d1b70ab01
font_01_sfnt_off0002b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE87 19516 bytes
SHA-256: a3ef804bcf03fa0f4083b5bb1f760ad3cc7d56f9a5ba99d59e2fd850fe8252cc

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