Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb741db2dacb137…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 13:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 914f9acef12dd4ea43be052d80b8ed16 SHA-1: 23d31ba08b9011b82798902c948c00d650050299 SHA-256: deb741db2dacb13710656f4f26acdbf1146ffa4fee7625b5d876874c7dddb4a3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple heuristics indicate it is a link farm pointing to compromised WordPress upload directories. ClamAV also detected it as a phishing trojan. These factors suggest the PDF is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613388b1dbf52---15208771107.pdf In PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/60539067009.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317c472a66b---dekerikades.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/20903288118.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/99018981412.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0f48de1a---denudinubesaki.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/64752590605.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109031223009076.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/viwovoku.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08a010fc7---57541699676.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4639001301.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/78591116890.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/givegezabizu.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/97292082356.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2b7faeb1c2c6f871eb6e452d9b8ce257/11316208235.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nolunoboxivifake.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/tabopejanumo.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/fodiziniz.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/sukavis.pdfIn PDF document text
    • https://aksusu.com/upload/files/56989038655.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vezeriwodozegovelokumuj.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9adf4ba602d7de1d30665fca198beda6/diwemumesepov.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pisiwev.pdfIn PDF document text
    • http://mayjack.com/upload/files/miwogafojudiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+add+icloud+email+on+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_off0000b7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 10540 bytes
SHA-256: 4ca9c6795c84ac5b4e45f3a7ea3f777ac7acdfdd17da0fc3b16892800636f9cd
font_01_sfnt_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 15992 bytes
SHA-256: c3a48081be1897e27fab9be9a54b719f2b28b6079117d7a8bce6d009a7cf3355

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