Malicious PDF — malware analysis report

Static analysis result for SHA-256 174cae86044a9f06…

MALICIOUS

PDF

86.9 KB Created: 2021-08-10 00:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 126f60f39c6a5c07699bfe53c01caa7b SHA-1: e409d92dce524dcb9f2e1773e112f5b02840b1cc SHA-256: 174cae86044a9f0638b2f6703a5cdcf9df7782a448c118fbf5c08430530b46fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be acting as a link farm to redirect users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=estandarizaci%C3%B3n+del+hidr%C3%B3xido+de+sodio+con+ftalato+%C3%A1cido+de+potasio PDF link annotation
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072402321080554.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cba11638f---22917429788.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/90001837701.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/ronuvu.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/losedarovopusodekanowow.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d06a7e4859b---33907296699.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38980313396.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/53779271945.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/do83cqrconlcr5k5g9stba9ngp/7202576447.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/sadex.pdfIn PDF document text
    • http://myphamasia.net/upload/files/14130917294.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a166ad9db63---57115269485.pdfIn PDF document text
    • http://techbis.pl/files/file/52808303109.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/vogewelawufadede.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/43c8032c17ef2e13acca9894b2d55928/20596055760.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/76825222370.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/dodiluditeteterevibuk.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9142c209d24e362ca212d9dcb41be79a/36958307513.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957027e1dfd---48161526649.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/galojulonesegelifuwosoni.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tsblrhhhassfmebjudp29chdm5/kumorotiba.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/65981130141.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93211046765.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_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 19260 bytes
SHA-256: 2be11ea1e3ca6fbff16bb44a5c52b5d1aa14776919a34e59169ca44f8f3dbdce
font_01_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 11180 bytes
SHA-256: 2b4189ad3ba09694470a9b81d3170ebf27d5c8b41aa14c9d6b17f80c70b654ff
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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