Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ab63f94c5708aa…

MALICIOUS

PDF

167.9 KB Created: 2021-06-19 07:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0488997a3a5199314f08b165fa9cc473 SHA-1: 35edd6c41cf816cfca23929720912e1bf6c6bab8 SHA-256: 73ab63f94c5708aab75607cceae6417bd78e2ae55dee5adc68971bc069feaa5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

Heuristics 5

  • 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.
  • 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://manuscripthandler.com/userfiles/file/47751606261.pdf In PDF document text
    • http://allmedicus.com/userfiles/file/40791158235.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6595b5e4e---93580836877.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3bd389cdd---wiwagifudapol.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5300b9c8247ffaeae18b55438f30d864/75810268224.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a150a61cc3---mipaguvibenuwavajugozibiv.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fea38414---derofabaliwilalulexab.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/af3a663b30b83b5f4d6854efc21349fe/46887046380.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76911829831.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a89c09d71---gemoji.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6c559c4ce22e6e3d91a971d280e48db4/92122481485.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vlg4o095dcqdpistmdbk7acenk/97712331937.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d98f4d1e50578738e9b6623939feae97/doroxesugekajip.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fakaxuserujaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+thor+ragnarok+123PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000261ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261CE 5276 bytes
SHA-256: db3ea51b100d4c3d127d5fa733a48c704e88e371207cb434568f677eea03b824
font_01_sfnt_off000273d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273D6 14516 bytes
SHA-256: 0d0db6f2a2c4935438d5e0c95a476161a9a43780049ffdb58d0eb2edae0ef7a4

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