Malicious PDF — malware analysis report

Static analysis result for SHA-256 61450755bc06e458…

MALICIOUS

PDF

158.3 KB Created: 2021-07-17 13:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 97b7548dd0d124789c2f4b73a8f57a0b SHA-1: 86b7838a1c9e75244b99164668cf9a0faf9ab2a6 SHA-256: 61450755bc06e458830dcc4d1484bf25ec680acbbafbb4dd479e0fa2d5feb4c6
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also functions as a link farm, directing users to multiple compromised websites hosting PDF files. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

Heuristics 9

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gasnguyenanhst.com/js/ckfinder/userfiles/files/sipuzuros.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/gibekidobilisajikori.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9cc21e19d4e09d6feda6a9be0f81fd6d/67167558268.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbb1b4ae3---27088165256.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1757d526da---makipejibosawagagez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba62eeecd0---97403931162.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aae552b66---togaguw.pdfIn PDF document text
    • http://simonide.org/userfiles/file/11676300424.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b0278de46f90a6733b20cc37a81c4bb0/faxagabokavogilatifob.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/dimojivirenaludu.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/26730326830.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/72894064612.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ccsmunkqc9s849moi0rdvfgkf7/fugasobozara.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/91521344043.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce344ab3fd---99870118129.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kobamamab.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/21602193197.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wafazepu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927b79407dd---soguxupoliwakunuvafobasi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mav62s6mism2dlrgbhuuto124h/nogoxuw.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/kefinijoxajasaxo.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6om1thf26cr526t25mie7031c3/wufod.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2jrdgcua59k4mccrfpjk6vo388/wiwajivenebojisupo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089df5dd1b68---53289755451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ocr+a+textbook+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F540 10528 bytes
SHA-256: 3b849580fe3b9aa4dd5703ec93f7739c7fe890dc3e557c66c8e2c24caf5b44a4
font_01_sfnt_off00020d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D80 2984 bytes
SHA-256: 1e87a723ffdacc481136658b2120c454b1cb716983a787bec5391d3fb0de35ce
font_02_sfnt_off00021a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A00 22076 bytes
SHA-256: 28f999be65fc4262e27149d27981b47f68fd5c648ba9b4db0735681a9148332c
font_03_sfnt_off0002532c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2532C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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