Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c23a4b176820c7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 06:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: afe6f04f626eb1ba91d162608961d13c SHA-1: 19d6ce30afa3f40370fa63ce4f7b2e82f5f394ad SHA-256: 90c23a4b176820c71500a68fe0b58bd2c134945e7c68634d177565101b98f2f3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage. This pattern suggests an attempt to lure users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lrm.mcdonalds.ua/ckfinder/userfiles/files/60970687646.pdf In PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/52464730876.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/85712395442.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/sinarubegorijilibux.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/votuxefawadisikigibub.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kofigesebozojub.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/23703674224.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130443255875---49307743677.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/folate.pdfIn PDF document text
    • http://canoeing.by/pics/files/pejusujexofuxaxese.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/68931682586.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1330784a---41058566641.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nijifavekurijadelatiwasi.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/46748534191.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/28203252218.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/naxidezodi.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631139124.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pepinorivafubejow.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0d1763ca---pedafosinowegomajidajira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+transfer+photos+from+one+phone+to+anotherPDF 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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 18000 bytes
SHA-256: f038e52a3be7b9df735d5472e40fe883b9c4fe587a4bed737819ca3fcc6ca4c0
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10560 bytes
SHA-256: af7edc07573b3cb7c01e9e4f3a00db637a15332b3701c6a372012fc59dd6ce6f
font_02_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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