Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8357ff146ec70f…

MALICIOUS

PDF

96.8 KB Created: 2021-07-07 18:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d3ed376ea9500c8c49f1df9970db028e SHA-1: 941d366d44dc31293425abf6111ccac19d5ea2b1 SHA-256: dc8357ff146ec70f2e61feffc9cb49e9b8ced3a33dfd10a6b9123eeda414f758
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to file upload directories of content management systems, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vikutazegutebuwunupiwa.pdf In PDF document text
    • http://bdn10.cz/files/file/11380367869.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/tadivufimezovugabe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n1dc09tubv3s3iagemufd7uhl4/badodov.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/93434477093.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/693833dbd011df3a519211e30107795b/lilotafidudezopep.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/bazenelanadekumobu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ruzifivinuzokazega.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/42999163502.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rosexewixifosukaduwa.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tipevu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160901bb4d4c12---pokokumawek.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b120d5bad69---42049650802.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc269331d8e---77581591368.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/854b93ec7fb37da1b0f0cae1d2c039f9/solupawil.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/guduxiwabulikopitetajerus.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/6005122248.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/50677838728.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc4dcaa66---wonopixarura.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85e2ef8ef---7943445197.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da03336e06---1118534556.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/72818019962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=twin+flame+heart+palpitations+separationPDF 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_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 17140 bytes
SHA-256: 9b68bad98449e8aa086835fcefbfc70ea0105fc80ffb5811ce5b33b886c15ab1
font_01_sfnt_off000143dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF3 10672 bytes
SHA-256: 3b065df49cc92849923bb40b0ef903aa9041930bc9b6ddd93ffa5556611e1f21

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