Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a66a1400d920c4…

MALICIOUS

PDF

98.3 KB Created: 2021-09-12 11:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 587897b72f3b6cd847e662135de3ccc2 SHA-1: 111dd7c6c50257e3a7217c7c8390ce391f7e279e SHA-256: 94a66a1400d920c4b8eb690e24939308ad8a33aac1a3c36cd71beb5bd9c927df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ddtoyz.com/ckfinder/userfiles/files/85427216093.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4210b2c8e7043fa9e1c063b050c8104e/kivojabutepuxe.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/muredotedusevuxoxuripob.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/tonunug.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/mopojozadikozojarokakepad.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/dunawepigamo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f641d6546d---pimabofixoruxojel.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/26842749463.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/zezilivawosimiwofu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/54312592759.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/goxobufixuxal.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163124810386.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6138f90751f84.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/58551103650.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecce880c3---64323885420.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76ef616e9---mipaso.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/68290059247.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ad727ff246f7f0300476a0ab3c86bc8d/zedegitapos.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/38395097197.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/3300394787.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/86099550823.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/banuborigovetoleridir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+talented+mr+ripley+full+book+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_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 18516 bytes
SHA-256: 4bf8c0754f381412e695b86b6e97b87581941332463e7f400f013a1dff531a79
font_02_sfnt_off000161fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FA 11004 bytes
SHA-256: 40a34e626f802492e0b685829986ecbda1ee8b2d52e5d4dbe6b888e610e85f8d

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