Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ece3b06a79a758…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 06:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e8073a1e628987711074cebe8c768b1 SHA-1: 19b514ab7eed2a543885590106cf7930740dcec1 SHA-256: 43ece3b06a79a75874405e0225778d9a272c18b1bc4fdf0f47480b1e4c716f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=bhagwat+geeta+in+gujarati+pdf+free+download PDF link annotation
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/pemeven.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/pukirofujefise.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/zoxasexox.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vazalamogefugovakidadubit.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c05ec2226---83570135337.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/91107912248.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b916c0426---rakinuzubivuwutudazipima.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/rarepebazukufowip.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/8611653712.pdfIn PDF document text
    • https://manenshop.com/upload/files/papejemikasakudunage.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/92864541550.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/32862150822.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161374e991adbe---susejulufuwubirawasamaf.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dinaniluzurab.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/jalobedalolote.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/kuratovuk.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/53037977029.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/22893922446.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/makejim.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/doruvuzorow.pdfIn PDF document text
    • http://bakoca.hu/files/file/gabosujoraluname.pdfIn PDF document text
    • http://jsdarvin.com/files/jenezir.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1c835dfd7---57210979922.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/rakubura.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/ferifase.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_off0000b614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 10976 bytes
SHA-256: ed2160fba6f2f1f63800793baf46153bb2e855ef4257a4517b02b39bba9f034d
font_02_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 17244 bytes
SHA-256: 8bdfd852e98dba9ab09d35675966058d55ed71514f1d19dc1a4af57dd68146cf

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