Malicious PDF — malware analysis report

Static analysis result for SHA-256 672e4221fc7c0846…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 23:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dcf49e3376bc98d7f64424152d03396 SHA-1: d428da2bb4b579f6719c01fdc7f291e8aa09999f SHA-256: 672e4221fc7c08469921992de5519fc4f894e273a7ecc5d19a2a8b7a82c28556
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to distribute further malware or engage in phishing. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=write+the+simplest+polynomial+function+with+the+given+roots+worksheet PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/825df83c1fc9beb580010cc6e7cb5ce1/14131153031.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9c4d3b7a1914f6ba7992f4631489d406/gobirukuraduputiwu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128a5f21c8c1---10240697648.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/negeza.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/69249408727.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/69680104598.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db5c4e7ca---zutovedux.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/48196057145.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/16525205928.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/gojumofifokirujip.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/76472264791.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/vobazupavukugojazubub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b577e25---85824763476.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d6c9d10e5---xiridepumotu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/xutirixubotekaf.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6b777d2e---witizegurowazunasabikowol.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/45326600493.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874bae6bb5a---mokivosavexizotuline.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/goduj.pdfIn PDF document text
    • https://msvadba.ru/files/file/37970099031.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/73866314367.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/tijamowifusiz.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/63822449940.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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 11376 bytes
SHA-256: 956b8df69b46a4105fb288af938e00355027004244676ce67ae4d7fa94736698
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 17792 bytes
SHA-256: 31b4c09b7c68e029ffe85bc84032a2ba7a2a3aa631a7738e7222259c229a06cd
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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