Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e298cbac9bd40c3…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 04:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ace2d2ad7a798bcd2dccaa93c183a6a3 SHA-1: baa4906a88779c06fcfbeb7e888e94d2e7af47bd SHA-256: 4e298cbac9bd40c34b0159fe040ac997b779978eb82c27cab6c50bc510e712f2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ellissi.org/userfiles/files/31417821.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160755d9241f6f---49408750260.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/22348549470.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072359cac874---gabipatirerowoka.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8e9fe6da1eccf858dd212b18fd4a2a10/51413886041.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/67164497073.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/5090802379.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7756384b6f---60236335021.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/58904460657.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/jidaverigipi.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/jenibexojipijosovewovevub.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/72978931158.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/gujofulivalaza.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/94955263488.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3ecd361---31691026181.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bb2cefc8---dodewifazufa.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/wugisidowe.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/70150821438.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6ae91b1fa7ce3529cb542ba040249e3a/wesovukesakuxasowake.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/82bf5bc2fe6fe5647f229e861fc7406c/29666319680.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ddb5112874c4f68807471311360610f5/43567900916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=market+research+vs+marketing+research+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_off0000b74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 11052 bytes
SHA-256: 2020c0bba1e213720ac65d3f1f3164fe99eb2a6657977948650f6296faccf574
font_01_sfnt_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 17396 bytes
SHA-256: b5821f8136c4696270808d933d94068926ab3f23e2b6be807e0bf3975b714fad

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