Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f84e79a0be28c…

MALICIOUS

PDF

62.3 KB Created: 2021-09-27 23:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4eaf40259b05cf551120741743a89de3 SHA-1: 7cd52526f7154e4e3c2d5ec96932b917fb0f927f SHA-256: ae0f84e79a0be28cda03f7f2f42c61391e2f79246e44929111377cb9e1335bf5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

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://mut-zur-veraenderung-hambuch.de/userfiles/file/fafiwawa.pdf In PDF document text
    • http://bdsductri.com/upload/files/mumopibuzatoduluxekezefen.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/95313151098.pdfIn PDF document text
    • http://ewtch.com/upload/files/tonelebavivajogupag.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/38628291584.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/dulaxo.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/3168413033.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/wedir.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sn1mescnvu7dgtspkdsbpvqjv0/97570435076.pdfIn PDF document text
    • http://guowangcable.com/d/files/tapixigomezideritosi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/55502371026.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ponavixukobe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146cbc7d739e---39123501569.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/bakakijixatamex.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/siladaninidobipe.pdfIn PDF document text
    • https://thietbigas.net/media/files/zuvumajilu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7f20f36943a0304e47d45aa782ed7dbb/defavesajaf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056e0a186a---74173892060.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/36356969310.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/19580550495.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0od0s7plho6u9km5ub3skvigvd/7859401432.pdfIn PDF document text
    • https://geniodelweb.com/file/88607175398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+paid+apps+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8D 15232 bytes
SHA-256: 8bcc7f64b407cca10f90a621521c98aa42f37ab8e51240b882f8a2ac3af9d8fa
font_01_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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