Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e797fec304998c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 15:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea91afc01a4bb0d0aa59701f82ef978f SHA-1: 655ad5999289de381a0f6133ce9c25e59628481e SHA-256: 24e797fec304998c9cd30376fe4ef3a1a49cf7784dd1030c0bbb13a02e739035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zanhotel.ro/beficientconsultingFiles/file/jejuniwafovofiziwujawek.pdf In PDF document text
    • http://industrialdevices.in/uploads/tamajabiwosafujubemogej.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eadb2a756f---jipusukasimomeraz.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/10092526504.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/39158948353.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f739791bf28---fojevozabubifete.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/mulejawebutifewezamuwelu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5256c11809688bbbc24e38d69886c68d/kagef.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/zixik.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/97939997029.pdfIn PDF document text
    • http://gabortech.com/admin/file/noneramedixufojuvos.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/lugobanugarekunagafur.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/7020688424.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18aa55d565---97393897298.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t33is4qetrkm8ubf9j8qrbiumk/durimasuxad.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ca187ae4---xawilezabos.pdfIn PDF document text
    • http://charivne.info/images/file/madofirelaxexujuxifuwumum.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/44456066364.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/71dbd069bc3c9afa202bf8437e92901e/26512017960.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/80777868692.pdfIn PDF document text
    • https://digireg.org/upload/10864420877.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608df1f7a4c52---gevaruxezuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=compl%C3%A9ment+de+nom+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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10320 bytes
SHA-256: 18877f76681aa27badb1b1bf5f23ece266dde9d6a055154a0521b4874922c5ad
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 20136 bytes
SHA-256: 87380b459852f9e4b8db64795a24f86d7729192eb4c4acf81060ee1d607230b9
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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