Malicious PDF — malware analysis report

Static analysis result for SHA-256 205a9c1fb24ff5e0…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 15:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6bea9432e5c77200bb87c82ae6f043f9 SHA-1: 9b707b97a804a0b3d5ae7c6e0315dee9a653b8b9 SHA-256: 205a9c1fb24ff5e012b2ac0e3ca0104739d489504a734cef9c7e7bc615fcb35f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used to redirect users. The presence of these links indicates an attempt to direct users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hotelamadeustorino.com/userfiles/files/3345454557.pdf In PDF document text
    • http://alemotta.com/resources/original/file/mapezegalurogakeviwomina.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/lafobetoz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b35ea68c---nejomefagulifavinotan.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb9f9175c---molumoxa.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/fotinajumaxojunus.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/6f6af593f4852e1adfd1e1b300c27f8b/82628997639.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b39dc1d0---resenudujixibaribitonop.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4fe064620eca9b45db0c40fe195d85be/35325523424.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89721c18a0---29298536894.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/nijuma.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d530f0d069---82515929736.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/726e0e415d94b5180fb8f231b0c16176/mogikofovonobu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec19d0899216850a0001d8595ce5bc44/fuvopuvevegagesubafuf.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/04910a88d5887d7732b65e1b2a4babf5/mavapopikok.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6bc74041---zatewarog.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/78261403743.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/af39a6b2bff224753f94d621b7e82d48/jupizetekebikamufetosimuj.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/93778444803.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/bumabafo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/91fd2f46555aeefc48352151374d39b3/71034710256.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/30895498384.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928fdf0e0c4---70927053542.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede0b21636---6444938815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dear+sister+wedding+anniversary+wishes+for+sisterPDF 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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 10856 bytes
SHA-256: 4906cbe08c77b69ae8bc95068fdef74d681603a0041764a7f8a0453a174ece96
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16040 bytes
SHA-256: a9d585602b14e7d64c979d6d9948a58a6c39e987662ba6846b9beed26eea0a4f

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