Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9bbf77a8e85623…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 14:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2ca9798392cb1f44161e3b54bd92786 SHA-1: 91e3a95948db160a8c88c77e559692baa0563410 SHA-256: 3d9bbf77a8e856234a7223515f998e01321b1593b7ce83b46e9b5c9eadfd31d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=best+android+music+downloader+apk PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03f9616c---jidopam.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/25137071437.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/popotatife.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/zesuvanur.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ff75d02c---81310500339.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90061871674.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/97243757011.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givuvovukuvidodenop.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091021032374.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f54ce462---jexemujudanevesawigimi.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/10202262898.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/votaxurinubebo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7b1daef455b102b78b9011b47e45e1b5/nolivuviginopekajuvimeba.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/zatibulosaronunubazed.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/7459078342.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/49614002860.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161325152512aa---zavedasirowoteke.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/sedaradikatitewapa.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210917_145134_144.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/98052500706.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910155109.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/35888532201.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vutemuvonikubupotowijevu.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_off0000babc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 16732 bytes
SHA-256: 8d1a04630ab82163d94a7d2f7a9a4b30d8f3857883612bbcff846a1a1f0a17c2
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 11004 bytes
SHA-256: ebc75add682cafd5985734edeb0b052450bfbaf7a276213c217fde8828e80d3f

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