Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec66733f3af77579…

MALICIOUS

PDF

265.0 KB Created: 2021-06-26 18:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b8b58ea381cb2e8ba404068c10d090c9 SHA-1: 7c60720d4ee5883d83a3f5c684d0155a043c8a9e SHA-256: ec66733f3af7757999e32cbd799bf3d2c6a98e260f19daf4799755d5863acdd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting it's part of a phishing campaign to distribute malware. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into downloading a malicious file. While no scripts were directly extracted, the presence of compromised CMS upload links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609e59ea21b23---liduwodu.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cb63b387f64---14897819116.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gozizibujera.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/54e26062e7d8e352c87d29e1ba23b8bc/zulejakaremexoduvimasen.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a5b5d1636cbff91bb43a2d13c4fd8348/45693320535.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/1094405860.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/vamijiv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a4e95ae9---pisivaju.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/97498666679.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wolozigidemivop.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160715b537f7af---fenozafasu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/aef55755e2a4217f7993e8ff6ddbebc2/9562238788.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wanimijovobirupowazuza.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/184de3af8e2952c4edbcce12be840a1d/3608370684.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d1070ee0---lipowebasivurumadarata.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6b0ir14g2vuj2m8tv7u3gj7t19/21220392655.pdfIn PDF document text
    • http://iworking.vn/uploads/files/54177428516.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608e698b370d1---kemizituzobotopajifagipoz.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/74233889135.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a429725a---revawexuderilufifenazo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3db990d6---kofixopurutegifotezex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=answer+one+call+centerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00039c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B462 18036 bytes
SHA-256: eeeee0871dd3919d9fa47abcc4c3419c44dc20606a3cb36e70fc26af9df0b2f6
font_02_sfnt_off0003e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E43C 10196 bytes
SHA-256: 99600972f0dd5ea9fbc025aa21effc25e80762f8b445ee69bb723fb10bdcceac
font_03_sfnt_off0003fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FB5C 17568 bytes
SHA-256: 280c80ed168bae4a212a521e68e33e527abe5bf736876356abc2cc6d0ce86076

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