Malicious PDF — malware analysis report

Static analysis result for SHA-256 285a44b9b0f689b6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 00:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13a58915940efdb69f25fbd9d548b4c2 SHA-1: 562a9c7a904ccf9a2e29999ef199ca63ca4b4583 SHA-256: 285a44b9b0f689b614ce2cf1d3a908092ab3cc89820dd6df5e401be4bb525aa7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://residenceraffaellotorino.com/userfiles/files/fadirivugudupoperiw.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jn7jjo0rjg2hutqdl3cg7q166p/52621388840.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/12519783912.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/27129233439.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210814_084301.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16087550bed346---90953595799.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/44979039530.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071782025f95---43416272984.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/10687353872.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769f765e64---90609326100.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/33264260914.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/dujimemo.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/68763585887.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/04f133fcf751efe788f370c5984aa389/wizitugowafomumukerod.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da5ab28f204---tarowaratafogazofefaw.pdfIn PDF document text
    • http://gabortech.com/admin/file/degigix.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092501fb56ca---37082163115.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fkuii6nrehf51d0skdnld2smrb/34945649461.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/sifokexow.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///28461157421.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f140552a3d---vuvosobijasurun.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/39461067020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=icars+ataxia+scale+pdfPDF 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 19716 bytes
SHA-256: d49dfc9291884561cf6b9b15282118dc4bba9e52b92bcc53105147c26c768996
font_01_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 10440 bytes
SHA-256: 5b9109d9ac6d62005ebceb162f4fac0a8ff1b78fed86207e9b37aa2ee5cd7a1c
font_02_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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