Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed7dbf3b774bad3…

MALICIOUS

PDF

94.6 KB Created: 2021-07-30 01:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 61e7fd9958d8ceecf89737ce4f8772aa SHA-1: 52218e44f3f31df3ca065f44b07ae5289887d3b9 SHA-256: fed7dbf3b774bad33b271497ce706f15b87401384375b40cdfb1cab9cc6864d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or SEO poisoning attempt. While no scripts were directly extracted, the presence of external URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://accidentmatters.com/ckfinder/userfiles/files/gapazovoxuxibuwekavagu.pdf In PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16220208975208.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/34809655952.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/98325427830.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/zunexepuraxasinirosa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160885c93111f5---murugomixubemalizibimixub.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/107743452811620735269.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3934cb3f---pofamapusepifudexawafafe.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/24777293843.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ja25icektfekif6rhujg34ci74/wuboxo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51237679503.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7e1c2dc93---68287782912.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/80899736749.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b658bfef---50530503141.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v957dnq4ie53cfc1d7ussc7s44/fesosu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b05ae8a1c---93627005001.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/xemukama.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/59853000671.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75dde419d---55512716002.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d636316db---supavudifakawafita.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b309aa4638---disulodefifuraxowax.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/zikebiwutekiw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/50f94a49e1ea53e28ed192799808ff50/67556970590.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7753b4bf6b34fc99fe28f3b98547b1ba/58901241007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=solucionario+mecanica+de+fluidos+frank+white+5ta+edicion+espa%C3%B1ol+pdfPDF 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_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 11576 bytes
SHA-256: 2c16e5d94f70147ffb5109dda103f7ffe8d24dc6b6d65442af6acd4715593e46
font_02_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 20472 bytes
SHA-256: 87a6af3ff9a9076fec6bdad1ca48b1c904d4205e92c0b2aa645d3c78a6a13aa4

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