Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64aa5845dc04070…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 05:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfe4a890823d873f57538fa5630d111b SHA-1: 9839f57ea0dea60a9baf884eb9f9d69737103ec6 SHA-256: d64aa5845dc040708cf090291db78f3b3d0207854e0034a1de8c9c4a50e0dad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used for phishing or malware distribution. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=how+to+restore+deleted+items+on+android', likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=how+to+restore+deleted+items+on+android PDF link annotation
    • https://psfund.org/public/uploads/files/cms_files/bigamokokuronijow.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/294535b110ecb3b857b830358f7abbdd/wapufuge.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91871425774.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lenoligakufemiwebuwuvo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4402d3738---xibixagadunimavega.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131004907d71---rimelavuga.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pazanujazave.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/girakukarodoz.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/64009874619.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/tumopeviz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/05t24ej9k8hguucdv1ov5uf315/94247545380.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74146951295.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/tebami.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/60398635111.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dafukajotan.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/42795574720.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/91815747575.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/29382839917.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/44011956806.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/tixasizi.pdfIn PDF document text
    • http://lactopad.com/uploads/files/23445158831.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/36996237367.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/37847544366.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/92974618471.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/bubager.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_off0000bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9F 16500 bytes
SHA-256: b4517bcdb6f0977bc804e75dd1c36466fc97d3a96b447704bdf8dd8685178afc
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10484 bytes
SHA-256: d1c3f7beb398d7b7fe2151f2dd23c5f3ade41d59f836f1d7d0b87a3f40bec719
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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