Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f28b9a34356f1e0…

MALICIOUS

PDF

63.8 KB Created: 2021-05-04 17:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f2cc6a08a8c154c49f12d82e5de8258 SHA-1: 0f280e5157ddfd9a7c50d935e64107269b563591 SHA-256: 8f28b9a34356f1e0e2b3afe759f812d10601109a53291b22fd72e92b07bffa74
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to host malicious content on potentially compromised infrastructure. Although no scripts were explicitly extracted, the nature of the links and the ClamAV detection as Pdf.Phishing.Trojan strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8888

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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da75caae60---79938397280.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4ac173de82ae76673c5120b8dabbf3e8/26006629061.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b8e5714---33855441241.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/68aff0473f61c42fa15e61c3e9e2f866/25834955502.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0eceeae5---55744565005.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085242bc3bdf---53767184801.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa279efe2---wepibixipopakuvapadibijel.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/972cd5ab8d0b2675b04ee3537a5aa869/daduvorubesojoxaw.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70e588a0b---guvukerukixurikivoz.pdf
    • https://alarrabnews.com/images/content/content/file/dofesuvadumuwafu.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160821aa5cbbb7---temujemo.pdf
    • http://accessiblevehicleservices.com/userfiles/file/93354570488.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5dd1f772---tirusorobusipuzi.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160830a7f54222---bafavoxukumuwirap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=employee+registration+form+doc
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c0.bin
99988fdc55b8af8e85d9fd3f7d974413fbd8c56d1cfaf9e2895d8808de2769c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 5532 bytes
font_01_sfnt_off0000e389.bin
5141a13d3f5b04aea0b4440fe3b60a5ad29754291e2c55775e668f038c6c1d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 9984 bytes

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