Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad30a1cf62a5663e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 11:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea4b2eb2f2f4c0e09f9174097975e65b SHA-1: 3f18828d668c0b60c1762bb6e1bde640fd21bc59 SHA-256: ad30a1cf62a5663ee70e7459b2b2b84d98dea8c57889541d21c7d66cf72539ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier also flagged it with high confidence, indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://www.tekkoo.net/images/library/File/jomezakitosidipiwadi.pdf In PDF document text
    • http://nguyenthaotech.com/upload/files/98556973519.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/18124864346.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/masasa.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/79984338158.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/rojirebefurowom.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/wugegasu.pdfIn PDF document text
    • https://limmaginebistrot.com/file/66466763253.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///94773382159.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cba1894e5927bb6c64ff80a011d5796d/50504832047.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085b28874699---7337314405.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///wukomemusotifavepusow.pdfIn PDF document text
    • http://uco-kampen.com/media/files/13494254632.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/65854984829.pdfIn PDF document text
    • https://securitydm.com/slicice/file/68150939934.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/linuredebekimejoz.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/939061c76ab3efee0ac581466140f839/58890851108.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/fexilirevebokefewavixofu.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/41710250268.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e21944d1964---zuvoxavamavonowaxisi.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/25304982379.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wijuzemilipunigede.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/76738392202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=polynomials+class+9+extra+questions+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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 20212 bytes
SHA-256: 86cafd612c616637c01606db658bd2c37a156ff704bb46bd6fb8ae903076dc31
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 11412 bytes
SHA-256: c1cccf695e737c525bb63012ecf3c7b05fb7b98e02f7f08ea806d45c9fd0cdf5
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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