Malicious PDF — malware analysis report

Static analysis result for SHA-256 486c69787653b7ad…

MALICIOUS

PDF

90.9 KB Created: 2021-05-27 23:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f79c5ab6f34b1b82707ef0c7e3206956 SHA-1: 6a7a64090f6f470324c9d21f514ddfe3fad995bb SHA-256: 486c69787653b7ad92590e89c14b276567f7106c0ff962f21375fcac3b6fe715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file functions as a link farm, containing numerous URLs that redirect to various external websites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary attack pattern being the redirection of users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=ejercicios+de+funcion+lineal+con+grafica+resueltos PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ee352b87a5309de68a4496f8cab02f95/64636765295.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084a905a54d8---fujajitonemaronu.pdfIn PDF document text
    • https://activepymes.com/pub/file/25942915462.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/nejegibegaz.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a2b8cdf74c249794e937dd93af46ee89/98864291253.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/61551198664.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/63896095359.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348d230105---56017721672.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tafemuxudipalijot.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4016f0623f65ecbbefe4eff8b35fb091/wewuzewinitozobezomo.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/98603101823.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e9f48e2bb35ac5d5fede0f6e05f1c8b4/23881238112.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fc67fb58---zegano.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/04de8361ecedddd33170d2963972ffef/wekezi.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/59833855162.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 5964 bytes
SHA-256: 6079be6aad231ce2a09a26791a92751cb4a913f7252d46e077699a283a040ebf
font_01_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 5220 bytes
SHA-256: ef5c5a05206f342d6e08af56ea15caab7adf8a1a51173226b58fd3cc9f33b1c7
font_02_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 11840 bytes
SHA-256: f36a6a917b0be8671b622480abe3937ac37ddb01d1337189642981288ba842bc