Malicious PDF — malware analysis report

Static analysis result for SHA-256 4807f0f559637d38…

MALICIOUS

PDF

86.4 KB Created: 2021-08-01 13:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78a3d41fd2e310e62d975639592bb134 SHA-1: ebac0f9c70a9e68c73b673f83263415c6b0d2877 SHA-256: 4807f0f559637d3850b0dbae5ed9db3ef96c101053b0359322931f9189e25235
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, with numerous links pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to direct users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a887ed9e---nesetitusasozov.pdf In PDF document text
    • http://headrepublic.pl/images/files/sokelupofefije.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/tuwufulododot.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/84640754924.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/69113519679.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86eb7c4dd---xofasutowipikomazidaxaz.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/tuxikapojupote.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jukexugav.pdfIn PDF document text
    • https://edusfera.pl/upload/file/suwawiwala.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b2kc9i40o4nr9ccvdn7nr6lge3/koxiresiritopugimem.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/389f2a1ebb0df2b7619e2eeb54f6b2fb/18795803619.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870089c891b---pituzafuzivakiwagokokopek.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210630_99C692ABDF8E046D.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab233c1dd4a---21424852980.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/80337281240.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/kagijiw.pdfIn PDF document text
    • http://muszempilla.com/files/file/8633930471.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/47100586591.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3071f67e---suzemovegejikiru.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/45882660650.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/1669964487.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/44f1977db7a19236e584468abb1be7e7/65287196846.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/63094305340.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/dabijom.pdfIn PDF document text
    • http://expresskaliski.info/file/vegitukesog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=algebra+2+common+core+curriculum+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 11192 bytes
SHA-256: de15b1a12927a662e99464a77379740c26271dfba35e116f15cc65231cd16846
font_02_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 18048 bytes
SHA-256: 9cdfcd43b90ea0f107facbcc015495a860d600021f8944400dd9ff7156794a88

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