Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c4eb53c033e9fe…

MALICIOUS

PDF

73.3 KB Created: 2021-08-31 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5367fdba044cba2539aea855b562768 SHA-1: de955ac47ec4411c40e82390d61bcaf4ddad9cc2 SHA-256: 24c4eb53c033e9fef1e90a2a331ef1b121512d8ce54f665e33534420dc73d5a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a common PDF-based lure technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://stoneappeal.in/FCKeditor/file/gavuruxo.pdf In PDF document text
    • https://carlojans.com/cms/file/jojaj.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c25955c2f---rakarorosudogu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1fd1cfb55---sufexuk.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/janezewum.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6907c5187---sotigomerixededunewug.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/nerepobijodolifepuxofem.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/n7k7ng5tft13ovkj43nb5qhsf7/92795952644.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/15086260203.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf52e3937---10190974406.pdfIn PDF document text
    • http://www.bandungmesin.com/file/kunip.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ee9b9c73d2281247b849cde11a7a92ad/97828121543.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/vonupigejekaze.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/bagorafaxadudu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a4d3a7fqf13g4sv8003h4hka86/32318577199.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a800c48e7---duworenabox.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/63574750148.pdfIn PDF document text
    • http://jarosi.hu/files/file/jinol.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108070346309258.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/xaxamaxedijagoji.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc09b0e92c66d78ddae1753f46e13279/37908828370.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/60546204389.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-19-11-01-35-tlgaPxWs.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=12+tone+music+definitionPDF 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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 10504 bytes
SHA-256: 8aaeeb974f5e1fb24d87617054ba3b869424d2487bd3c78940ca0be4a4a72a6e
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 15648 bytes
SHA-256: c98a32ff6fbce45fd141775f7e65633bae76450f4065cf05319e9a86782e69f2

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