Malicious PDF — malware analysis report

Static analysis result for SHA-256 a210b325d111a50c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a53311af58c4d96afae1dce40b6c1bf SHA-1: 4bd994d63eca1f2b4ca3ca6446be16b74a8a5b31 SHA-256: a210b325d111a50cd50d3d54f3497aca4404342136749815c008bc8eb67cd551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF itself does not contain readable text, but its structure and embedded URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c91d2d312---38769566743.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/4b32390939fb77321fab3c939e4d8e53/wuxolidefo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6f802f2c7ccbcbfcb97243383716742f/vofederoxesimovo.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/35188080830.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mimejiwukututikokip.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2892971549.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/025cf54833ab3bd21ed0ddf90ddbd4b0/92373330589.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/83247129943.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/supibawub.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613544f4ea57a---gogarinemisivaxifiwokunij.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210907_5E4B1EB22AE8B3B4.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/95283147093.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/bexokutexezevimuwuwige.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/jikimadit.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/puravanejexodu.pdfIn PDF document text
    • http://3sdent.com/upload/files/pozijafotejeduwef.pdfIn PDF document text
    • http://fxmeat.com/upload/file/19cc30197d017523cf9d52c03744f128.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/52766501540.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/lawegerubunapupu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/takeniba.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/34017188773.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21802cf9c---42157014361.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee9e0ebdc---lenorokiwelijumarelosur.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210904_F179188EED408A38.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/foxakife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=english+file+4th+edition+pre+intermediate+pdf+downloadPDF 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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 17740 bytes
SHA-256: 6b5fa7853dddccd8c676762e495668400c4b1b3ffdb975404b954a5725191ab7
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 11092 bytes
SHA-256: 3c2dcd4c34c4951aafddfa92398a0bec7e59ec77dc14c07d07840c14cf5e21bb

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