Malicious PDF — malware analysis report

Static analysis result for SHA-256 09259715f04afa7f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 18:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37d36dc25f53bc4b5bbe35c5daf48976 SHA-1: d23d0b8fd355bab4bf55fb3e853239cc8f72b276 SHA-256: 09259715f04afa7fde2b0f711c817bc556e263847565e5951b7d12343c01d0ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous other PDF files hosted on compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ddpelk8rlacuhibhfpt5erlfh/70083849592.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210626013353_lhtp7t.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nenopivafasenimazilir.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5af56704a---50499387278.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/49498225861.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/37046580676.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc9525aa0c---54585927857.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/83328011455.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9a80efeabb0103b8581a20d99662a90e/logowe.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/55113501884.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8632733c315ac510ce2fc93b17682f30/2771398168.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/paragipabigukilujepapav.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2395b28795b189a359e7154646676d31/xumago.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/20858060479.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bd6af00b675d279b1c03a3082314684c/mefewinuzaditaxovimune.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf71ba8542---7670871831.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/2741406025.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/muxorumuror.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/6590890896.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5f37c477aab7e6a5f14f9e8addaf7250/siwijajolividamosogak.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/podejimeraxato.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5280c851b---88014279262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sea+water+treatment+plant+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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10440 bytes
SHA-256: f32a024990dadb62a8fdf3fe7f601cc0c5bd5595c47f8c5b9f1d1131608d5203
font_02_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 17172 bytes
SHA-256: 49c8287c117932e7da5107314db5564418d899fefac9f4b252432db309a56f52

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