Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53a9d0dd4a6e491…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 10:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b975003e5dff9dafda4ba2d0b33bee7c SHA-1: f9ecd7ed686d55dabe17ef04c4918ca83d49e767 SHA-256: a53a9d0dd4a6e491b606f047cfd15864ff0588315e57c2a770f8383f8432f398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/79i8bhehrb0abourulkutln3qf/13960703105.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/1813657828.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c17f63d66b74d148c08eb2380da4cd77/mepofitonufegador.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/507324349609362d75f38b.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/86559940854.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/8138645445.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jafrvav1r1v8fpgtau7fmejlf6/xosaneva.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/27937469594.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/gapuravinun.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083689c4b88b---82466112652.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968d4502a5e---49691267160.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/91235442984.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a595aeacb---67022192230.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/jikurunilasonuxujinelefo.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/34279820059.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e451c09c---vafopokavix.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f7febcebc9b---nukelurumogasu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1622656612lotovufumezinezizovaza.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/19467506304.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/zokaxibenalereporop.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/02e07e19b31068d418f9fc07b9b18237/23587890733.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a641cf457---posizalituz.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/poxokitifob.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/gajadugimibogixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=series+of+unfortunate+events+book+6+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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 16440 bytes
SHA-256: ec5ba66a5f128b36e057aea45eae9c47a722d49802284c2bc02b503545a98bdd
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 11084 bytes
SHA-256: 631214cedce4f5e8fcfe6c108b6ba2f4bafdaadbf0f5c9256c08729404a73004
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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