Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d572813248f946…

MALICIOUS

PDF

66.5 KB Created: 2021-09-03 08:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2d219b2f2618a3ad1b8e548c679d366 SHA-1: 63374d84b1de7b0bbfc8332532fa02a5071c8980 SHA-256: e9d572813248f9462201207bfb312ff379ecfd5215cce7ae0e90949145e973d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it as malicious. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://huntic.ru/uplcv?utm_term=report+cards+comments+for+esl+students+pdf PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9c3be5853---41230410681.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d904fd36---90292340123.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gasupizenidokun.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/73783628451.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/95843026daac6dff53b03d484c531ad2/tufurubumav.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2014c26cb---46021036935.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717efc068f1---sibirevupalave.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/vajedivesuf.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/629397b1b617c9921fa3b3b1b38570ea/22974675406.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/40934852639.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/74997985241.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zejigenalunetebogogisasa.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/17169413249.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/25726576956.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b807de26640---robamusosekelunanoruzulag.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/31441658362.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xututeziro.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/12067368474.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210901020827.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/46888482455.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iqa8km06krgh2c76uotlt7cnte/ripef.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gaduvaseginuxunefunudoz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e531a995b4f---kijowuxesakafovosima.pdfIn PDF document text
    • 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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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