Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e21304a9244df8…

MALICIOUS

PDF

70.7 KB Created: 2021-10-09 04:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f94da5258d732bdea3ec08b281823c9f SHA-1: bbef7b76fe80fdd4648c794d43c687ef354a70e9 SHA-256: 32e21304a9244df84a8fe0d37609f3b3654b7af6cc53a0f5d4cf32dc4f50dff8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm that directs users to various external websites, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially malicious or compromised sites is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7446

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.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc55b596ac---tefavex.pdf In PDF document text
    • http://astprom.ru/sites/default/files/file/legaxawun.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/bofoko.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/08dfc379000eed56d2c05cd736bbcc91/59846269965.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ejak3l7mcbujqunnqb00m91hv4/tadazut.pdfIn PDF document text
    • https://iwistw.com/upload/files/nifiwubobawuxabixavotowu.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/wepusugeteno.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/80436771909.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bamatigorodamirirelelu.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/winon.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/62055814580.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/66806260852.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/sekelutolobukakituzunoduj.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131307d943a5---5211278437.pdfIn PDF document text
    • https://bfull.ru/uploads/files/34072432534.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/22513851389.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12163583410.pdfIn PDF document text
    • https://activepymes.com/pub/file/kapuvujus.pdfIn PDF document text
    • http://fullprotec.com/ckfinder/userfiles/files/kutixuro.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/349282947.pdfIn PDF document text
    • http://anpo.vn/upload/files/52010797564.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/69548358814.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/40637709229.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/9539479610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=combined+formula+of+mean+median+and+modePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 20912 bytes
SHA-256: 268f2eb661e20550de5b9bc14dd9038fa3c9c9c3aab44cd24e659d41381709fe

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