Malicious PDF — malware analysis report

Static analysis result for SHA-256 782c8f77b69c6e75…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 04:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3d2288b625b7fea170fdebf032acd33 SHA-1: 4ef4dc1f47b5fb81259586e1de9f546cfa555c85 SHA-256: 782c8f77b69c6e7552cc728bd81de36216d04bce68d7c707e9c95e334cfa336a
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6699

Heuristics 5

  • 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
  • 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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2a604099---lezelupegamapinemikome.pdf In PDF document text
    • https://dallaslandscapedesign.com/media/files/silul.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6a7a0aae9---dotavopasa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d0494074c---tegijigerel.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/bivefe.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vivilusuwosusixobak.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/renijokokusozatenid.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/72326966816.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/40955633922.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/sepubamufoxiligudawi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa3fe12---kojalanav.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/mesorukegedodevizujof.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/82697812377.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/15458052330.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/gedekaxafudamesekolatu.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/mevakapajeriginoweg.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/tapadunuxatikisika.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f8869268c78714a6d92aee749a15fe70/digofipokobaximufifatujak.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bb4b7825---77152514642.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021971750118531.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/tovipuraxevofofes.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/bovejidinazuj.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/suwado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hacking+apps+android+phonesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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