Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a7aae2937c4694…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 14:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6c80915676b31da26e90191e6191791 SHA-1: 12ff02df188dcbd76b60696e712274196c5004fe SHA-256: 66a7aae2937c469431b4a6bb35413ea896bb266bd3d37e3f17f0d5cf7b418cce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The document also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sgotomotiv.org/upload/files/44289477882.pdf In PDF document text
    • http://rollfactorytogo.com/uploads/files/dotosexetamudulufexavev.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/91558931216.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/tafufaxekenodalewikixamob.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kabiz.pdfIn PDF document text
    • https://ksuskalology.com/images/file/88544125587.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091806014373499.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/38058607612.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/99173847595.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3770b688---falusuzemor.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/39677931395.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hgh7s3vdmjmnt5cmqr0he255hh/relebodituluroku.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/mizajan.pdfIn PDF document text
    • http://w-mill.jp/images/file/wezozijawerulugo.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/29942633585.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gubojaterewomewodije.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/tuganetofadesem.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d1ca65ce62fb47624095a2d41a548a87/99469539154.pdfIn PDF document text
    • https://greenways.at/userfiles/file/timisu.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/rejajekixoxawi.pdfIn PDF document text
    • https://baglab.pl/galeria/file/pipuvexul.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b048e221bb---12954626203.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/wavunivitovofavitu.pdfIn PDF document text
    • https://kimcert.net/E/file/81329365404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=king+mod+apk+free+firePDF 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_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 10612 bytes
SHA-256: 4ef165ba0bdbddb74029dc1580e026cec2977941d30faa71fc5084a1be7ff6c6
font_02_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 17620 bytes
SHA-256: 892262bb80292e7dc7a06891c6415133775328889a05ead671baa90e1530f9e1

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