Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a2e4fd3e359e08…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 01:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bc6a6613cc99f922c07d45f5e49c853 SHA-1: 84d2d6a25af99ba4ad7b33aad1a08e8229d70305 SHA-256: 60a2e4fd3e359e08623b948f269ab238ec1eddb858346fcc7a0467654aaa246c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or redirect the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://resttour.com/images/userfiles/files/16850876255.pdf In PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/81300404413.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334334dc24a---pimusunan.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/35649044557.pdfIn PDF document text
    • http://jn-zhsc.com/upload/larojurekotivexumoxeput.pdfIn PDF document text
    • http://mobitransjogja.com/files/negiwunaxawimamid.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321c36ae80a---13116598789.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/bepexukow.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904185121.pdfIn PDF document text
    • http://195exim.com/datas/files/26898762976.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/mubabetadexejizolivipi.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/zefimeju.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/wigaxonurokugawonorojiri.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/82949423315.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08f0d44e5---70139462306.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/42913617083.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/32761799506.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/30922199765.pdfIn PDF document text
    • http://come2menorca.com/images/file/wefopigawotetoganesel.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tufokaman.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/78398199067.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/15023618311.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jumelazoxosarovovefusu.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/34641818962.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/difekumofakotatus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=horizon+4+apkPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17836 bytes
SHA-256: a3d624a3951df95a1ad1e2897def42aeee5feca3c0c56d8113c69c854bb5ddd3
font_02_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 10024 bytes
SHA-256: 5fc8f85e502e490979eaaa45f09cf554ea38e9e6e932c438efb298687379a3ea

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