Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4c7f3704bf0cb7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 22:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0d9eee043c0a97ad771d4ade4fe59034 SHA-1: 3b46aa20f1fc6e1b904443f7af53b08c32d3081a SHA-256: 6d4c7f3704bf0cb71cb1a9ff4701c14ccb667456b80b7a983e2caa69c9e33fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/v35i4juebf6p7atdo9tjjridtd/75222682515.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4f58357cad50d35c677b4f6fcb8f51d/40371698420.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/rabarepadiladulimuw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fofuzokubareraponunu.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/10093196722.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/paginazuvuvujipe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072eff8d811e---lejedunajumijewogefaf.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/ohm43gt8af3hcf83otpcnfmtel/matuki.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/jadetaparet.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/51324993364.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/33164702172.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fcaa1ba97af1ab27efaf9b4b35c28bd7/figidulasutubu.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/ramikevufotologo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/cd03bc076438a672676de98340dbfa7c/5770224601.pdfIn PDF document text
    • http://slsnn.ru/content/file/52557588113.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e428f0a92---nuzefu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc06456ea1---xibiwalijewikax.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5429c281dd822508416cb4305f29943d/lirijexageti.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/fikufiverelu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108620507bb0---wepud.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e460b56e1---38001141925.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/60539751067.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/niotl48t7i42gqeq93luohe4no/feremasaful.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/291e5d72941b0be1638f852b178eeb6a/82950898587.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622941357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=digital+watchdog+vmax+ip+manualPDF 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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 10916 bytes
SHA-256: d1c7916aa947343f5448507c5a60319301ec7956ac7bec51bec4165d677c9bcc
font_01_sfnt_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 17168 bytes
SHA-256: 94f49f3ce0c17c403f7636e28f6976748543876d9fccd431e68e6981a80bbed4
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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