Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dff61b47a28d50…

MALICIOUS

PDF

80.6 KB Created: 2021-10-26 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: cd8fda330fa4bf28b02c5fa7de50380e SHA-1: b0db38399e8c8e4a62c969c0378e228f44288cb5 SHA-256: c3dff61b47a28d505a283c98d313f429b76694764ccd15057ca1d7f8632069fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious content. The presence of embedded JavaScript further supports its malicious intent, likely to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://yushendesign.com/images_fck/file/1631332594.pdf In PDF document text
    • https://peusch.lu/userfiles/files/93683823708.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/xijujigezizibudom.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/zigomuragurovepukoxazotu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/13911763072.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429064c8280---kotusurerudikajufob.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ce558b6a9---9732853539.pdfIn PDF document text
    • http://spbi.cz/res/file/ratosixazifudiku.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/tediresisabawepegos.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mivozajalowabipukutezare.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/ruximiregisarado.pdfIn PDF document text
    • http://guowangcable.com/d/files/tifisurowepo.pdfIn PDF document text
    • https://clickbox.ro/images/file/7248716043.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/89813292655.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/75780283041.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/8577951259.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f741247585---36389633248.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d026a8b36---pojakibe.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/26010043759.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a9b875cae---30897831011.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/13596716636.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/fagokupixuru.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/62021201973.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/61272022091.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/netoser.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=sports+induced+asthmaPDF 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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 17332 bytes
SHA-256: 5d340c2e8ace7e9a4b2eee090b02ab3cac279e507e82750bb6715a7626710a50
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 10908 bytes
SHA-256: 5215f6622bda7ed7138f1a4eb8e02275b3c88427355d33b5683b4063319cf8fd

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