Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaf7d4ac597c73c…

MALICIOUS

PDF

62.8 KB Created: 2021-05-19 07:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef78cf17c4e58eb59214e0dc44293516 SHA-1: 10f9a828767c27aa1f825fa5654c7037f623eba9 SHA-256: beaf7d4ac597c73cda3c9a22191d44c8d5887807fe6a921192dcf7add37a9c3d
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8553

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://agrilaui.com/userfiles/file/64690364153.pdf
    • http://axiomestates.com/userfiles/file/36060280370.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2570b2659---46744839243.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3c0dcbd4---zufujunizegi.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a7b14564---28465348992.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dacefe799c---68717403737.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8db30839e---xunokisupemil.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080741acbd75---36981250396.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4a2f0e2a9a5ef9db999fb096ee84f22b/potoruvoxivovod.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f2ab0a04---82667571070.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f7691cb8---12104539539.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6769af83---jixefuxerizor.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mtpejiasjmufh82rihtj78lr95/wobedesuzerurevon.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7662c17c58c224f743df7ed04ca2e349/23519931647.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dba24987fa42a5deca4f62373c0ba784/23260052772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+become+a+medical+interpreter+in+canada
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddff.bin
1f1158e8eee4c488431262145b419a5d702aebb082c649f893215ab6917220b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 5232 bytes

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