Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52c9626fb4bb9b4…

MALICIOUS

PDF

92.9 KB Created: 2021-07-29 22:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 792ebe368fe82f484599a337c276b1d4 SHA-1: 135390ae154352888d0e8e1c66e41907afc5676e SHA-256: a52c9626fb4bb9b422169c9404796e38d8ee022c8302be1c4751e55748ae6782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, but the structure strongly suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://uniquecharacters.com/upload/files/koxaxosadiwulikanal.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160848563dd7b0---memuvopiz.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/24956820372.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6fdcadc8c944ec2cb55f5b3aa231b490/97803219847.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/84692523004.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f4135d64ce6347e97ada7c7c16c53db5/10007371661.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b412192628c---17558824877.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/vafizufiviwizevemuwu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d36aca13cde---lakifusizifoso.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1fea37f60---kenefipo.pdfIn PDF document text
    • http://clarasonic.com/upload/file/2016213515.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728cd26fe3f---93510902357.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717670cf373---65466820746.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fre2f8uvtc9oehobbqbb5f4qq3/61950432282.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6cfa6b75---bugetoxojovovasuvare.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/romaw.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/57323034171.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210709085512.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e104c826---44057683711.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca22e55df9---nilejeburomobalilev.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8565ef389b1083e80935afe93f79f58c/39060017632.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/40522001649.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843367cd8c---15539342702.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/giwutugikipukipitono.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5927000148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=advantages+and+disadvantages+of+nuclear+power+plant+in+bangladeshPDF 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_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 11272 bytes
SHA-256: 931acefa517a5185f8ab05014490e7893e3c1642ab629d2e70b10d3245acb2a1
font_01_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 17264 bytes
SHA-256: 6a5a5b50c494710a7aa62adcb4546ec8c494522c4450b3714cd20b8753be3aee
font_02_sfnt_off00014beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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