Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b32d242eef98388…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 06:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 362f5a42d8a7f19f2b8046f51a07c949 SHA-1: 0ef2c1648df9e3a73a543f4f06e53df60ba15eff SHA-256: 5b32d242eef98388614451b5f24aef6a6582d5efb621917655eaf4a7596a3af9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e35087ec6---tipawasuvojipajula.pdf In PDF document text
    • https://transport-vehicules.fr/userfiles/file/gotuzosokufatese.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mimiraxerugamubidukaz.pdfIn PDF document text
    • https://teamcode.net/upload/files/50032061403.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/911fu245ffe4ml65c85tjhbsea/86216950001.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/masakug.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/setugud.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/zixewagulox.pdfIn PDF document text
    • http://protok.pro/upload/files/ligesebilati.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/vipujejikixefosesamivum.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/zoviresuban.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/32578268061.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_66018E2605FB2F1D.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/20621467216.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/nuvifusomiwu.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/52486097714.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/68814124417.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aa2911e9206949df761bc0e63f3d051a/tadatopukagobeve.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/xezatosulaxaxupowiju.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/21675821762.pdfIn PDF document text
    • http://potlista.com/file/files/67363884122.pdfIn PDF document text
    • https://thepainter.asia/upload/files/87879991469.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/xodanomuwaweji.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/54f80a9644bd71af5bef0a19d6bb5964/voxudigiwadekabasatosuz.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/dibokedododadulutega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=art+set+apkPDF 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_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 9956 bytes
SHA-256: 8ce0dcdea0532aec309d3fbe03b66e340ccad6ffa2fdbb6eff3b70b81b75a1f3
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 18228 bytes
SHA-256: 5ed8a4c3c9fc55a8eceea87638b0a2af33b8c057a2a6e650dcff22508356b87d

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