Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c93ffea906eff8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 23:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bde83cea097b68a050326b4a38160132 SHA-1: d5241546b8dc51ae4019bc03a8ec068a11e1a339 SHA-256: a2c93ffea906eff82f8e6d737e826d9d3370befb2ba84297d0e9439035bb9b7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161371e2cc439c---38480995953.pdf In PDF document text
    • http://akbarestate.com/survey/userfiles/files/2030037623.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mewumutepos.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/sikujew.pdfIn PDF document text
    • http://uchid.com/uploads/file/lidatuneged.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/webixomujeveziguf.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xasomibuxaxisevubawululag.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d2203b9---bomomikizug.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/36198738935.pdfIn PDF document text
    • https://kaimano.it/file/34622418068.pdfIn PDF document text
    • http://slsnn.ru/content/files/wenozijumupamegisujewag.pdfIn PDF document text
    • http://citty.org/images/uploads/file/65015253942.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/82379920073.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/23380346759.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/90363910298.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142b603d5c69---16133608139.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210912003619.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/55329128227.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/newen.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f42ed40dafb515b07ab7140f9d4b5689/tewimewifezidu.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/24248231301.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/62069914521.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/257d8de1c51a85224ed98b08fb3309cd/sexadapubedagazi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/88a8bf3a729623ab3683814fb2a06956/nawimivulewazo.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/muxagupikapamevipa.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901071323182507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chal+mera+putt+2+movie+download+filmywapPDF 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://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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 11112 bytes
SHA-256: 70f766123cca7b0cb986484d0bbe45863180977f054d4c05c8c8cdf972a03637
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 17444 bytes
SHA-256: 4ca8eb635236c403d0c4d25932084007753fc3e108493d00d27239e9f25f4e15

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