Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d33bb871fe7555f…

MALICIOUS

PDF

73.4 KB Created: 2021-08-23 15:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb27e3cc4fb43f6c153c8d4967621f62 SHA-1: ffc3e02b3d6eee00002af24e748e789e2b23f3d9 SHA-256: 0d33bb871fe7555f44ebf6301458ff250b06430cec8f9236679babbd90db40de
144 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or distributing further malware. The presence of external URIs and IP address literals further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.hkfew.org.hk/ckfinder/userfiles/files/rinomusuwapolofi.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/vifutufitomidoradawat.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb18d96a5---42479896220.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/84405842307.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608efede8fa20---vodovunarogogisak.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16119e98087960---12596741689.pdfIn PDF document text
    • https://plasy.com/uploads/file/digudexatodori.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10a5d2bb3---6278944189.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/26170112080.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b64ec034.pdfIn PDF document text
    • http://change4best.ru/upload/file/46329020921.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/karokoganopanekopikena.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1bbac578fd20cabb4169579003c39e7f/92746778641.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160720a18b3803---98309833258.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ripegalovo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b644f1c5fcf---potejinoxufobixada.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1611517f5e1569---84520673765.pdfPDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f4v46nt247skbl1oijl1vgge22/zinogerut.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/jezidumelipelefug.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/ponivuloforokotosukutif.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wivasutiposebovo.pdfIn PDF document text
    • https://digireg.cz/upload/duruwelowanituwaxe.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/94375948827.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d46de065ad4d34b75c04efd95a9333a3/kedugebewepusokes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=networking+cables+and+connectors+pdfPDF link annotation
    • 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_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 16104 bytes
SHA-256: cfd15c3f1b9dd0e4aee2f9cc46a0b4df46f294c28858871cc29b37067210024a
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 11092 bytes
SHA-256: a2c5268bec71b34199465b530e90e76fc2c6ac7e905500e2bb8f192d74219463

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