Malicious PDF — malware analysis report

Static analysis result for SHA-256 328149ce0fcd3d14…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 12:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba5aabd8b829deffeda185bbd542616f SHA-1: b4bd2c1559574df2867d41c7aabc161479e124a0 SHA-256: 328149ce0fcd3d14f160fdbf07daae098d562dc227e20dd1b5d718dfe5def3a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised websites, including one hosted on a WordPress upload directory. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anmimar.com/royal/userfiles/file/65263877408.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/882151937582aed07b43f97f3ada4c51/68158392590.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/bobiz.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b185c7efb---masuvudumotemagipitetewi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/muligukrek3n0r2qbnaiiesb4p/72803063869.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/wuwifaxemew.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/545899ed122a0e155d64e797054bf9b6/67930256333.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8445e7f8a7d974186ebec1ae6e9c1ff9/zipop.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/pogefogepokozi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tjbtodh0uiutqmceqel1kfighg/55280301481.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/fuzoratikigan.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157a783be5---76724894954.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/jojitabunelewozoribe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7818c477d---basuzadifexuvino.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be2de5fdd---32168941863.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071130fb5d72---fisorojulamejozivem.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/59954379388.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210601_94B660685D8C5F16.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/91729778155.pdfIn PDF document text
    • http://jucal.es/images/file/detenipunejaruj.pdfIn PDF document text
    • http://ktcz.eu/files/files/gizolejukuluwex.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/5214839183.pdfIn PDF document text
    • https://alutat.com/data/file/javateruzuri.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/sibk264koamto08kmnphc2us76/37515518175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=excel+template+for+bank+reconciliationPDF 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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10792 bytes
SHA-256: ca271280d542661d5beda98de549f6922e3d593900a73c64c6517d639ebd55bb
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 17540 bytes
SHA-256: d192205b9173a2e4113f0f316b930f6b57127ec89bb8bc78566e9ad409972b08