Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab4cd65feb2f140…

MALICIOUS

PDF

74.5 KB Created: 2021-08-28 10:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d096652e4e20357dec75db0096daf910 SHA-1: 20efddb42fe64490881e6ba2bdc794cdb029437a SHA-256: fab4cd65feb2f140363f93a68c51f98657c2b6eddb217008df7a9665fa7a6cb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the structure and heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe07b24ce---25388998714.pdf In PDF document text
    • http://dges.in/userfiles/file/jenenidunax.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f33c84018---34744343480.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608978942fb82---94964845669.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/xijelupefuxotamibitifot.pdfIn PDF document text
    • http://splogservice.ru/content/file/1003991740.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1t3l6us78aq72j90hr466hi212/49836770500.pdfIn PDF document text
    • https://dm288.com/slicice/file/97733221223.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/marapusotatuwafilode.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/wavorozo.pdfIn PDF document text
    • http://954move.com/clients/4890/File/96787388808.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/50007799903.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sakawafepese.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c393f08c31---28171500464.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/xopodinofa.pdfIn PDF document text
    • http://evola.it/userfiles/files/90314565430.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/93879911240.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e9fda7414a3dfe33609c075af8746e05/55925952384.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/29154878717.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098793567da9---38263364060.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/dipozur.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b771e2f6---15972865407.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccae4076e4---kewasabiketomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kc+and+kp+chemistryPDF 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_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 16776 bytes
SHA-256: eda241b0816d77c7cc370ebd67ab9f0b317c800258a6ff608bff58ca56d4d4d8
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10808 bytes
SHA-256: 25058b4a12b24db8d223638ad1bb17ecfe18fba10b11318caeb8a3e76911c9bb
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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