Malicious PDF — malware analysis report

Static analysis result for SHA-256 616b0286dd415371…

MALICIOUS

PDF

69.5 KB Created: 2021-09-14 23:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c6e47834228116a82ca2891fb599893 SHA-1: 936b3e5ec2a921f0303dfed0faff5e448e66df0a SHA-256: 616b0286dd415371dfe047ac87fc1b67c19ead211995ff106951f0522f0281eb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and other potentially malicious domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://pixomot.ru/uplcv?utm_term=android+for+windows7 PDF link annotation
    • http://missteenqueenuk.com/userfiles/file/13189493737.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vidafuzakudader.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/64045761248.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/velokikipiwig.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635aa57dcc---42028732694.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/fenufelikuw.pdfIn PDF document text
    • https://computerzone.pk/file/71662186421.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/9913626980.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd95db089d---zasiz.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161354941d3996---238444440.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/waduvaxafofina.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/30246654089.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/69236385030.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/370192773.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161308a7f77060---nazeturewitugopi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/9952579233.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e674162bb---nikab.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/19040809755.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/selurogo.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vupiwidunasepem.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/jotemuna.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/getotemasaxobaleximofe.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/kimajufuwovexifomu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/buvalaxibed.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10028 bytes
SHA-256: 1858fa6dd8d90d6c8fad71d28321149c24566411f7a6423d65e3b151b4ab2d85

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