Malicious PDF — malware analysis report

Static analysis result for SHA-256 698a66d76ce1ce44…

MALICIOUS

PDF

119.4 KB Created: 2021-06-26 07:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: afa32a9ed6aa03c0e8b9481e18eb62b1 SHA-1: 883b16e381fc59f0c7135e05ab541a3484968d24 SHA-256: 698a66d76ce1ce444954af82d95f88d9210c24c190c35d3c07954a969dfb6fee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised WordPress upload directories. The presence of multiple distinct hosts and UTM parameters suggests an attempt to distribute malicious links widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=what+is+the+meaning+of+enlightenment PDF link annotation
    • https://burlingame.com/wysiwygfiles/file/fiwogegapibof.pdfIn PDF document text
    • https://kristinanamaste.eu/files/mebotitunogunow.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kci59rbob0kho6fmd9bgt9n8t/pabefewowa.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/39127830548.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/o4qossh98i89jv57gnsvmkvvc0/85995079184.pdfIn PDF document text
    • http://xtra360.net/campannas/file/86230326932.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608390aa6af8a---4175142242.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/rivusudoxewejenuxefat.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e0eafe07a698ca56de9175d88cc20c87/69826734407.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6e95190b580ba0c0ba91c1bd733cf970/povabov.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b9aef94a---39424503244.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608359efa493f---99603885526.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/lewawidalipinogur.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6c9c0d719---kesurozixa.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4e8ac178---davawuluforebanukofagum.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/daaa0cd6c1d1b70d5691e28da3a59b2d/mexagufetu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160838ef07c08e---xasisasawigu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953a87a060d---15643825106.pdfIn PDF document text
    • https://subarini.ro/mm/file/42333103646.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/juwubo.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/56472426673.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/raperulazaligugoduw.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a945014c---bojomivudomipibu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca21aba5ed1b3f9d543c8e06f1d867c8/lapisojexujesexe.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_off00016ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD4 10552 bytes
SHA-256: d3ff8645cd8c88d258799928a144065cae49d6b6610700e4870f5dbcac43c14e
font_01_sfnt_off000182bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACD 21960 bytes
SHA-256: 277c9e2042996f1b500d2e41e4f1d8c664f11e5a1905ab433a913a906c896dba