Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b0218b5a3b7e3a…

MALICIOUS

PDF

99.1 KB Created: 2021-08-06 10:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2cd72cd176e65c0d40e86c87d889500 SHA-1: c9dc85621deb22f612cfe523aa0cce6af22d29ee SHA-256: 42b0218b5a3b7e3a3326f2e96dc9ad50b2e2f9f5f9a90089b22fc1a5b8bc9bc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are structured as a link farm, suggesting the primary purpose is to redirect users to potentially malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=how+to+adjust+rockshox+deluxe+rt3 PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/db0aa332f0bb1d85ed7682b70065c57d/rilixabixaporekavixanipu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c430091c78be520132f60f918757fa57/81307874090.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/bc4a75d18f2119393c4f105ad6e1a63e/13865598799.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29d824589---70641430547.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/givexenanoxow.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0807e9e1b767d9bad76ba0c1a9be4e1/zetifedop.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50390b29b7---butuxabibozuwegawisipavag.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2f5c68c09263ba88d248e16f39a58138/40789778720.pdfIn PDF document text
    • http://elitk.ru/_files/dedeb.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3f4cf05bae30207bf9e157d8252162ab/62645331178.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3f281b764340e8618e7bbda4bfd185cc/tibabitar.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd7d5d1f4---45951680550.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/92536329040.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/42290739058.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b494125e77b---46277618481.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7da558f465---21268045493.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/78562457586.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5toervb57e921rmisugn7r3pr1/77254361899.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/18813461906.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/47660891645.pdfIn PDF document text
    • http://tencanpowder.com/d/files/248231890.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///dixezemisonere.pdfIn PDF document text
    • 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_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 21520 bytes
SHA-256: 31e28562e7f9e6346b618c130d0180f22b4d736bb2099372c14a6f2b90a92060
font_01_sfnt_off00014d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3C 10944 bytes
SHA-256: e64166dffe64e070171dd1acca9d168e83920c50a064f9fa2f9d545d80d0f881
font_02_sfnt_off000166ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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