Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fd2c80c8b05a44…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 01:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6ba035fffcbea97ad6fbe50520b80dd4 SHA-1: cf6c5bf31f6fe79906fd12c04ff6b3a71305c7fc SHA-256: 71fd2c80c8b05a44253d1fde1cf04a5bd769e3fe0679889494eebfe8cf466a47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea that the embedded links are the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8245

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 http://ideas4mypool.com/userfiles/file/zavobuwixoxerup.pdf In PDF document text
    • http://biotledlight.com/userfiles/file/%5C/15036160407.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k7c7q6h8qss8igvtb6m0v81uc2/vilufarusegejerija.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607129ef69a11---66217611500.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4f2efcf12153a78acd5c8a4ecaf3400f/weraviguzavulovupumimo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7rq32hclhs12v9su3eq0geo83a/vevinadeduvavexaxe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef614d5aed---64089167686.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fd1b5c021---50908224524.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/67aa8f2839f422f21ac1e7e8f6862215/83197548636.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/11934060537.pdfIn PDF document text
    • http://kotolantopeni.cz/file/suvivizebekusonub.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kthb1ubs8h3nprnc55m2uj7g94/jugekulunuse.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/13587503233.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nobikavawosifuzexawafopom.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/019a9317eb7876efe536e8bda0a4d3de/16230583793.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/rotibilikenoremu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aditya+hrudayam+lyrics+in+telugu+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5660 bytes
SHA-256: 9e99cbce7eb20af45258805037563942888e63ede17ca69a37b3e1a6ac870ee0

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