Malicious PDF — malware analysis report

Static analysis result for SHA-256 027486b15eaa0b58…

MALICIOUS

PDF

57.9 KB Created: 2021-05-23 23:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b512ea8929d7e35d4bb00f704292ade SHA-1: c1b6d936532f1dea4432026cdfee48e65dad3d1e SHA-256: 027486b15eaa0b5803f33f21bd8f7dd317db24cc0a5b4c9562a40fc25c0065de
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

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.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a14dc7ed91a8e2bb1e92d6963737701b/gigebulobipebebeloke.pdf
    • http://acpiindia.com/userfiles/file/63307377541.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bad2eb10---78374209174.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ba050f7bfbff4f61573f512a7be99a79/lerexolabovokudesafaz.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160755d9607f33---65969890825.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc47a370c8---memifapaxuvowemasizikalon.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/079fd1b615e11a48e02422b8cb996953/taxobonifumupubituge.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f6aa89e54d4ae93b70b1da3ebe6bbb17/negujuwevawogaz.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16865ec2be---76191636205.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079e84c568---suzidinobutujex.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608773fb4420c---52730598078.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37b013d09---bazeferivuf.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b3eb179036c29e3f129de2f390a9234b/biriwosidenej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+conair+brush+rollers
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd6.bin
94d98e5b53b2048c0129b0a9e6af558c92128f9d35b828510528f95e67ff8354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 5080 bytes

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