Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff54f298ffd7b48e…

MALICIOUS

PDF

102.2 KB Created: 2021-09-02 21:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d9d546612ef4f0087f5bf5e25bf288b SHA-1: 608cc407b83fdbedeb3f4b31d540e615f075c08f SHA-256: ff54f298ffd7b48e8a3bfb464a96824a576f0fc1373121d6333132e3902688c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://novahealthclinic.ca/userfiles/file/86616196033.pdf In PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/buromudevijuwibufa.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/05a79b0db3b2306c9a3470abd1e280b5/17611120345.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079393fe5199---44734893441.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd28e8952b---47538056060.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rujokaxisogipanukisaguw.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mokkbfce81n4nlvp1mqiioolfv/nusevum.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309eb87b2dc---susese.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/06e2155ca95f0afe59ecd8b84e46f33f/fojilesogukelusajawovot.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/namoxavejagageko.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/watoganajefi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o1qh5ktokk14hh16ctatcrmjjk/6414591885.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/gilogokozopesaxubu.pdfIn PDF document text
    • http://strahyi.ru/images/file/71960477253.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6589538d5---68917533400.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4358e7e78---bisowowofumedes.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/07f7825b9bb6db5430062e7329f0f334/wemidunuferawet.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffbce12cf---gidepinikideve.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/bisuwofizuxalafisoziwudu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d397a78c02---nitewunekigi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160844d22ec155---pisolowudafamorukurem.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/16526734949.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/rosazuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=eschyle+les+perses+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_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 22888 bytes
SHA-256: d2d5cea82857a7d6aa9f7138d9069fd39783c7b1f5784802dd8eb2c75742a8ba
font_01_sfnt_off00015abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABE 10236 bytes
SHA-256: 3dea69ee2f8886372105be5ac2b3a9c2583fbc4e875f3baa6589522f767941ff
font_02_sfnt_off000171e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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