Malicious PDF — malware analysis report

Static analysis result for SHA-256 239cdfc7eb9093b3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 21:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 547d0e65492425901bd20dad4686fb93 SHA-1: 4265b7d0ac8023784ad6b987815e85e52345af3e SHA-256: 239cdfc7eb9093b3a3ba817a30fe9a8de7f2b34b8fffcc4dd2dc1900352051c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://geombiagioschettino.eu/userfiles/files/74595995763.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/komotumuj.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/19482282831.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130841688b36---xiwugowefe.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nefozexevidurinoziti.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/jamemuvarowisuviwume.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/41277299102.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/36856760046.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/68046064555.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/niniv.pdfIn PDF document text
    • http://ucokampen.com/media/files/86283068883.pdfIn PDF document text
    • https://guijek.com/userfiles/file/99018978952.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/45757272364.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/94810353007.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15715871256.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/572deec7d68a12c8a2ccacc7828e7b50/vemone.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/boralajemewela.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/80080b185441627ab8b1137bab3b0694/42596457139.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161392c6813f8f---33712007491.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/47738402403.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/8235440883.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/56129633699.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/57097261573.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/13476764889.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/sipevixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=latest+gms+installationPDF 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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 10308 bytes
SHA-256: e9e6fe39a06b003f19d5ff68d33ffd0f343acb3d2ab4f687206bde24590fbec8
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 18380 bytes
SHA-256: f575b01655cf6b0b79a8117d7fea051a1d57cc0c52f71bdfec367461b8272944
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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