Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8e6490f824a7e5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 20:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c1f84ab263686277af835590bc1d51d SHA-1: 3738625352c9fa2e954536bd7c7706c4e7808be3 SHA-256: 4d8e6490f824a7e582daede21704218ea0c69ff394edabeab16ad1db8db6e9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://terminarz.online/kosmetyczka/krakow/files/jepevilobuwi.pdf In PDF document text
    • https://la-klamm.org/userfiles/file/gajamixivovomatititi.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/foxaditodotuvaludofe.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/porelowonubaboz.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wiloverumerimo.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/10489433960.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/64f42ba1a633cc77a55851898c17ccc4/95014318619.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///pukobemu.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/15698110601.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/60610329494.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372935a01c1---78225852073.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/99721880984.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/23554060745.pdfIn PDF document text
    • http://bulmarconsult.com/files/juwutavebovutesetinixevul.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613406388a7b2---70424443757.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/78604559513.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/10359700810.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/mebosadibolamib.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jovos.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/68668417710.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xapifirapuvepesej.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/e38rt3ok042sjt87ues09oq966/puges.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dutivumuvevo.pdfIn PDF document text
    • http://popmetre.com/news/files/fipedogafitimezemotenif.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/46375961196.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/temisexizalijizukoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ge+spacemaker+washer+dryer+combo+manualPDF 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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 11160 bytes
SHA-256: b9ae3d35fb9dfd28a2368b166e20efae41661a710ceced25c7e5c89eb6640bf3
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 16764 bytes
SHA-256: 724c19d904d52527c5b8211962c0ea450c63725ab224f22e68eddd19b718f4e8

Open this report in the interactive analyzer, or submit your own file for analysis.