Malicious PDF — malware analysis report

Static analysis result for SHA-256 7961f4c925c32598…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 17:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78b95c8d0ff82d8e0195137e81f98da3 SHA-1: 2a45b9ee19de44bfacb0d19762c1df3049808b81 SHA-256: 7961f4c925c325980c0f3b97ffa2a5796af215d5c75c77d778888d6260d767dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/356e815e58373f06b5c0ea73fc86725c/xaxalupakemiv.pdf In PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/87995585300.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/tunekow.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/96072154003.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/37444235229.pdfIn PDF document text
    • http://ipceurope.com/assets/file/30021145604.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/fogeginodarelala.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/78779135655.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/22737923550.pdfIn PDF document text
    • http://veitali.com/upload/files/40373770021.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160de4b31f16c7---kuxewubegatojapami.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a7dadab6---8520446469.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1543ea24---1591034284.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f52ea806---tawapojuvavoxe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5gmp04u8d1jfqtlrdpdsplrgvb/sokulakovuxaraf.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/39002238852.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/55305680738.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/tamoz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4f02303b---tupipusikilovokejoxof.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jifatuwugagodunenere.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/48946826815.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/fipigefad.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gegamomamomuzupopere.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/dixowowevodonavurevigum.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ef8fg88inca7ug5re5ub4kn4om/fiwanese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=redragon+kumara+k552+rgb+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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 17068 bytes
SHA-256: dc6209d4c5d6c7a3bb5476ac988d11f9441bf1dd531d9c088a31abedbb2bb838
font_02_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10864 bytes
SHA-256: ddfcd6b03a08111061b4ddea020f8879058c78d5ffa868c3bd69b0eac0f9ae50

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