Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6481f0b0bf1fb25…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 04:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9a735be072e3b3511035f9bf3f70c19 SHA-1: 7edfa3d3d6dd57fb9b697f7a6cf84c015c3de689 SHA-256: c6481f0b0bf1fb258a7f0f977ec2a8abd8a052086ed7c20efb30dfc71df21961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on disposable or compromised domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links point to compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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 http://erictex.com/ufiles/files/37843353532.pdf In PDF document text
    • https://planet-for-events.de/userfiles/file/xubetesepajakogut.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210822_8E9A92B7C7BF2880.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/71956248357.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jotiletuzodarewe.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jorujet.pdfIn PDF document text
    • https://casentinoshopping.it/file/16733471352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86c39caa3---3576118961.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16278164551411520113.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/mevujodagibal.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0ce605e8---basedarijebilisurus.pdfIn PDF document text
    • http://industrialdevices.in/uploads/gelojiluni.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9a2468f288e05766e0512126542853e5/69407107001.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/de66gug45cjirth8ldad3o3nce/gukosokovetugasigodubor.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a784c87fe---19387116868.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e82ef13d---bobukegididopoje.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/fajejisifoteweporu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a1601d7a---lariwazadigaru.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7a92d5155---61080824101.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/29832524550.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/gakifun.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/39984002264.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/nosapuvad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plywood+bed+design+catalogue+pdfPDF 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_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 11136 bytes
SHA-256: 250290f723e6a9a1d8dec4bf83c7ab4f2218bbc9e86881cb94240ee894aec4f4
font_02_sfnt_off0001423f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 18392 bytes
SHA-256: 060bdf02b70c40aa4b3317bcb4c54877cbcc8b5505fe27d5e70d29f3c3ec6b31

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