Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ff4cc2f20565ae…

MALICIOUS

PDF

78.0 KB Created: 2021-08-12 01:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d97bc5c87e211a92a0e9fb7f4dff3b97 SHA-1: 8ad5af072d3b88b71e2682fb3f6bcfad17f7ca74 SHA-256: 18ff4cc2f20565ae32d4e0224aea7a0d8d9c06da2864aa07e150e589996f930a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be directing users to potentially malicious or phishing websites via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://crysiq.ru/uplcv?utm_term=2015+ashrae+handbook+pdf+free PDF link annotation
    • http://urparitet.ru/admin/ckfinder/userfiles/files/73545488647.pdfIn PDF document text
    • http://ahchala.com/img/file/gopipulinevo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bi4fua5v074e0f7ukeqihnibd5/nalazifuveruwajozopa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a068215c92c---baruj.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/b9gmgdv0qq1jp27k8aeb72pah3/nokuweroxomomofotawajide.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/fabibuluvafata.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729ea2e368---83351710589.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c431c3f6b---nisatoku.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/67478615553.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/52519435486.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd3cdb39---xutotorizisimap.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/52850867470.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/78654853837.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/85b69c14fd1bd22bc91ffe1c228f99e6/97481564651.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vmferkvcuke6mdn1kfdgatolb9/zotadamogotabufaxo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32627bb97---5622079147.pdfIn PDF document text
    • https://signika.pl/Upload/file/tasixijas.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/6532301593.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bf658a3fd78a8367c1297a1cbb3c392b/96304755822.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tvavehvlc7l1u1m2uvgnc2o6vu/jerofo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/12221313089.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/zejatefezovidus.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/16784313938.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/gowonexotolunonizumawevam.pdfIn PDF document text
    • 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_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 16408 bytes
SHA-256: 16e6ee41110762e844c356243b80cee051023416085fd60555988642a7b7cde6
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 10924 bytes
SHA-256: 9394440cfff7e41ef30be65df1ada1d42dec277f486bf954d534fb640c3407da

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