Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911dde90ea88c7f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0c28ebe77fd8f5fa622b615c77dc2bc SHA-1: b4e7004b7ec48724306dd4e90e21d56155879450 SHA-256: 4911dde90ea88c7f332dcac00e3dd5b91f216fcb3af6a0edb831eed40e1dd12d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them to further compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=adding+artwork+to+itunes+manually PDF link annotation
    • https://mashtalkandil.com/userfiles/file/goxoduzapaduludum.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a80ec85611033988755950f79bb6783f/pexiledovodawuz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/94cb3ae370271a7f7bb3425922321ab0/voxodozodilodi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160830aa773514---jorufetulitaladugovupek.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/42478996762.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/56314839423.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/pujeku.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210827185133906.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9669a938dd1995e7e3e6cd57859f05c9/zideja.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/10812101311.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/58426819910.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/bajubovafefi.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/sonuxixevuvusavusu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e79768dfe1bfe5dd82ff093c3e1d944f/rikozabuki.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/i3a70bdk66t1lrvcvpvr3oiua6/vawedejo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/62cd112267bec3fe16a6810e4df1e773/63600408578.pdfIn PDF document text
    • https://soechi.id/userfiles/file/51151160020.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/33e3bb0bb81a844e8bacec99b99edbc9/68398647024.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/tikivanamikek.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/zotetukemep.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/31156683728.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/17187560610.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a02248831cd---74702202491.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/patetagote.pdfIn 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://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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10964 bytes
SHA-256: 162f1a435b30f3f814bcffb4e09dc99b06f491c49bac76a007e685711c5f3fcc
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 17072 bytes
SHA-256: 76ca49c7b07cb1fbbe13fd950d5783cdb2e521193b3179b42506b7a1ca93809e