Malicious PDF — malware analysis report

Static analysis result for SHA-256 498a4e06fed8f67a…

MALICIOUS

PDF

98.5 KB Created: 2021-09-03 02:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e58db1f645f48b8b3678316372f2ab6f SHA-1: 03899e98af09a10e1be256b4333095bc4d2efd7f SHA-256: 498a4e06fed8f67ac2678fbedccafd18507031777d6e5449d488786fcd8888ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded URLs and the overall structure suggest this PDF is part of a phishing campaign, likely using spearphishing attachments to deliver the malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5914

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://archism.ru/uplcv?utm_term=rinnai+energysaver+308ftr+heater+manual PDF link annotation
    • http://gillsandgeckos.com/userfiles/file/10464709312.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/rowejigawabu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/ligamuxutaxinute.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tetazirusotuzi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c83d6463---fiwelovopuzitasez.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/23422828949.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860907189a8---zamuwi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/25901461060.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210714050353.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/30147885070.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed43055c3---80904834664.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/denigiwipugajobos.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/gobawatudexopajud.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126186156e53---gowetaxadejivisori.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/58307719217.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/futisar.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/jawoxemipogidavogumedor.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/wukodezazirezuziwam.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091155c704b3---kawazuwapajizufixuzukik.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/dbct50joav9p5j0iuevb7raro0/jopijiretiku.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d274ee3020---77517523772.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f308042ad---49721056409.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 19580 bytes
SHA-256: abef6d347de407d97d516e77517d185d722d1034407f9dd951d91eb82e2dc98c

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