Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2b52044d9124c2…

MALICIOUS

PDF

99.9 KB Created: 2021-09-03 18:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dbaf76dd57da65e4f551d9a1892b17b SHA-1: e97514d820fcac1bcb6df3bde892a7d863d19e41 SHA-256: fa2b52044d9124c204de3e30159151fea8ba450d8cd71b707fe287ee38e7588f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure points to a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://aaaexpressac.com/userfiles/file/lubumigusinitazu.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bc924c5d---jagenikomubevedizesiki.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/8441642587.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/47806575981.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zosovojugigodilo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/43587028939.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2928b0f04efd0f38691b886172ed9355/bilafamikakiwekovulo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c749768a812---fofizo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ecfc434cc4acb0f8f25334932b44596c/19607211973.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/kopopugizagimunuxi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8uhc4mq5hq99v0vknarl8e64l5/febebelojafosa.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/bawigikuvesudufelibenak.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eea7ea930---82302741501.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/vedopudiguz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4fcda70f---84044753189.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd459f9435c---83066047403.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/4325660473.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd19c81a55---59521961587.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/98b8e70983352c4f2018d642bbd4a207/29951910305.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/12979863592.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16287047885786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=shakespeare+henry+v+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10584 bytes
SHA-256: e8e61929a3ffd8705b009fc49639edfe95afe461a38765846e37a706ea81ac05
font_01_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15145 18696 bytes
SHA-256: 651e18b0ba1ec027fed6602652a33218be66522b869c2db6a823fd9e1e599203

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