Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b5d28a871c05ea…

MALICIOUS

PDF

77.7 KB Created: 2021-08-14 03:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee98c439f36bf51f13ba6ef06a3d5c4f SHA-1: e734e9fc45da09b7e9199142c1c187ee008a1371 SHA-256: 27b5d28a871c05ea95cc21f4b1e45681f7d127890bf19472d61f3f3363fb670f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8723

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.
  • 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
  • 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.hangmandigital.com/files/file/33870580832.pdf In PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735de5b8a03---limefudivezurutaforofago.pdfIn PDF document text
    • https://iltuosarto.com/file/74390541929.pdfIn PDF document text
    • https://aneri12.eu/res/file/rukodozuwezijurakagowodi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038cc86e2b---48673745456.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/1139179529.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/wujarepuwurosuw.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/gerixisodoverejibefupe.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c30f8b549df---30202964510.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/43584541153.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/8a1cfcfde06f9b7f2c8a2540d016d96a/95836151114.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/wuruteronijokifabubodesaf.pdfIn PDF document text
    • https://kartplast.com/resimler/files/dipegafevukoxanutuvo.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jawapabafamebutal.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078898dbf402---27121713930.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pi5qriod7goatlnpmi1mn7c9c2/jixudulalutemibabuxo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2d1981ce99e28e20ad969d20fe325f8a/nakezitu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vb7bdesr0tmsm8hnhuklg0de4h/gezopopavujeveset.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/11460218552.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c126bc3ca97---10731897140.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lewulu.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/49684638514.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/dabigutakofonoludalan.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723deac0830---dawaxosobexekegeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=modalverben+%C3%BCbungen+mit+l%C3%B6sungen+pdfPDF link annotation
    • 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 18200 bytes
SHA-256: 6bd45ae600ae5c4f1806bf655973294339ef985fda1534ad4bd5d3e8e12aa1c1
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 11548 bytes
SHA-256: ab6d772553fe177730d54b426de076b0c0767a153b93816a2e335027e3821a95