Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b7570dec1f6501…

MALICIOUS

PDF

92.2 KB Created: 2021-07-31 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 633f48a4474b8f7e8c0d5e9d1f9d554a SHA-1: b205ac6f8bb192ac4c17c3a437e8a236ac8221c1 SHA-256: b3b7570dec1f65010b007064e9882423e6ce2ba5aa790dad43ac486e1d5075a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary function appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1cab224da5edd337f21da83ac792cb35/72901895556.pdf In PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/kurabujisapabogajasofuze.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/47739240852.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/784fa84fd6d9fe1e3c66d91c1856953f/fefuzesudekubewibifeto.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/afcb4a170a7d9c4377d97595417d45a7/85538668896.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/49104119369.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6b227b0f8---63473654310.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d63eda68---sotowiteturuzujemaje.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/n5n1nfhc0r5o70qvtnqumbb1ni/bisuwoxejimaxomiguzofa.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/onne0dihtn6q1isui1d82njcs1/fagitud.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/253b6f3a313cda526e4a0bcd405046df/xemegapivokikeluk.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609934b00e755---tenogojubewekajusakekaduk.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kr76lukdf4ei51vslmussldu9f/29680365639.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210523163226.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/maputa.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210607145451.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35898a4e7---73171164011.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/47641358977.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/kasobudusimikexurazagaj.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe566b990---83915082200.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vejop.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/nebusafuf.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/ganoxaremifomipes.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/19103356231.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160999c6e81cb4---79750904342.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/lofenisizuzojijufixiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rakamlar%C4%B1n+evrensel+tarihi+ara%C5%9Ft%C4%B1rmaPDF 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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10744 bytes
SHA-256: 42195b859dbd67f2db5f6de2d25e14fcdddcc38fa4fd680f5808697a0719c598
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 19940 bytes
SHA-256: 63596e5deed089c595ced93d0cabbe1874decc8379ba0a2fdf77236a0968f4a2
font_02_sfnt_off000147ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1