Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1e3ff8f3adf352…

MALICIOUS

PDF

96.0 KB Created: 2021-07-30 00:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a23d4f1c18f8ff0e9577f2be460ca99 SHA-1: f3ffdec2d18c5708d5ac9aa0f6557557b69b3055 SHA-256: fb1e3ff8f3adf352ac95c2d100b9f14b2ddec2997d413fe7aadec184f1e1c2d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7113

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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3a00faa909043e6f20541c414d4a6f4d/76627765565.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f26f5ef---dizanifamuwapizavil.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5ab312af6c5861ffd3b0cbcb87a09ee4/93843479001.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/korivurelisox.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2c902915---38393214373.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/95923930477.pdfIn PDF document text
    • https://olterus.com/contents//files/fiweba.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/nixomezolakinud.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/rasawexekadetapigusafani.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/53c25895e486962670d893118913d8fc/pimuda.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cbe0452435efa7a3b3c9b3ca4a60b6a6/287616646.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xuvotu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/632880ae1ddd5700bd62da63756503e4/73544586709.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/27112f6f25be8eaeb61e109db675e74a/rurukivijatelib.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/26807995987.pdfIn PDF document text
    • http://azizolace.cz/images/file/fixufipanivajerovobim.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b084e67a4b8---12658455574.pdfIn PDF document text
    • http://bakoca.hu/files/file/38596682600.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/74495154164.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a43cdce2---zesijovukiru.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/fizigalibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comprehension+worksheets+for+grade+9+pdfPDF 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_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 17672 bytes
SHA-256: 4eae9262b0a57de45ffe15096c910b87cc12964db67a98b21a92460f42391514

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