Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfe1cd4a51aca50…

MALICIOUS

PDF

69.5 KB Created: 2021-06-24 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f816dd29351eb9c78ff095731da6ec SHA-1: 21ca45e76d83c03eac1b30b841f74e0c2f9d0d76 SHA-256: 9dfe1cd4a51aca50bdc6f67f35396c6419ece8ebde4ad4a8bd4dab366db4fc61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF file contains a link farm designed to redirect users to various PDF files hosted on compromised websites, masquerading as a fashion blouse design catalogue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interaction for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9699

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/69543040792.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5be142f3---polupojojazidetonib.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7780a76cb3e3b377698d41ab5e6c6cc4/17747945542.pdf
    • https://liantoong.com/archive/upload/files/75837181943.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/otgbt2u5q5djdd4jrpqtrh36tl/19639103271.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607677ca6b1dd---firafidekinisol.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca12d1e880---bupivamezunolikiwanebil.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7d17364aad4ce15bf7c287adc6b18697/xofipa.pdf
    • http://laduses.nl/image/file/76615708809.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/789b986c8a4a708b875e59fe47673094/janutofononafako.pdf
    • http://alliance-ltd.com/userfiles/dofadidimabepuguwizeroj.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4mefm1jjfitd68qm9pouu8q49s/72259758899.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab64174d6---46931814530.pdf
    • https://eminencesolutions.in/resources/userfiles/file/nimijugelejimof.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/84888041218.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ad0b6302---nukalaluzazu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/773f68db794f79ac0a7fa7eace60876b/87145041220.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ggr+fashion+blouse+designs+catalogue+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf4.bin
4b6a591c9cfea66ea6a8c24a5032fd27c99b1eed2afd984629cb99f5b896a5ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 5588 bytes

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