Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b550b0eeae1a13…

MALICIOUS

PDF

89.5 KB Created: 2021-09-02 09:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7098f0ac5556b1589cdd0c70d5a1c38c SHA-1: 1b52272e9db3ed14ecd196d185a01b4950ef11c9 SHA-256: 65b550b0eeae1a13828a7e99b410b8eb5da7c0622bb1eda7f4857733748f0bf7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to other malicious sites. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://zjqzzx.com/uploadfile/file/2021061914170473499.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dvgdivobgl5na27p9hgc9srv2l/ligepidaxi.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/19088990711.pdfIn PDF document text
    • https://msiutilities.net/documents/1395645260.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/4647893931.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rc7aeg9ffbslqut34eqkc9j9ad/fafexubakasovidi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/12956840265.pdfIn PDF document text
    • http://web68s.com/upload/files/50309668706.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/tedipexek.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/23332741403.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/26400473764.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/wevolopis.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/zuwul.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/41491a50ad0522e7d254f7694f35606b/54589519930.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/lanifavavaretapizazawed.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vefefujovutiwasizaf.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/68260730241.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cea8c72001133f1c2bd40b951ec27388/nanir.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fagutiluvovikonozeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cradle+to+cradle+remaking+the+way+we+make+things+summaryPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/66301c8507d47d68fa931284f038dedf/kesabutanivofugilolawex.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8efd36add15a05781fa7af5f516f8963/48210515424.pdfIn PDF document text
    • 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_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 17712 bytes
SHA-256: 49f8af0cd2ecf00ed7583956519136c65997997caa4f8c4f85d7cdb323b0b5b8
font_01_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 11240 bytes
SHA-256: 482b6ed777f93633d4e242828c88b756f8f87e082de239283de180019b760405

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