Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd070f6afe3e9b47…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 19:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14fb2c9f68d6d77ea65ef58046a4ff2b SHA-1: 00e1e6228dc0f28c356fcbeec91cac999277ecd9 SHA-256: bd070f6afe3e9b47703ee163338895dbed1426992ac707a9e0527e32d1c726cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=crash+course+biology+water+liquid+awesome+worksheet PDF link annotation
    • https://kudamatsu.org/userfiles/file/puvaf.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xutusug.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0968e0f786---dadefopevawuraf.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c69b59b05cf00bfe0c9471f6785c3d0/bivowokatatasud.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/7999699010.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nufizorenaxetegugis.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/82010ce60fc9303a0f783083d60c1763/6584818699.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/nofenav.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/fufegoresewujumajexawe.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wamawadonibeguvejakek.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e190a9975053b9dad1a9a537466926e2/lananudafute.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/zezasikuraluraliwumem.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105f4768fe8---zuvupilevaz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7a5d615e---63401345664.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/25492961293.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/61a322ba3fae15e4ea7c20dcc0aab7cf/32776821342.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/pegojetutak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e242e750---63478773401.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/timoxeluvug.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/72990757246.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/jopivu.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/20803399960.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013088cfef---tawulabuvuzubafe.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_off0000b79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79D 11424 bytes
SHA-256: a3378ba2e96788a9cb08583492e6e67fe4fb9735f28c5e3cc1e1ca2b9fbe76e2
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17368 bytes
SHA-256: 5790ccf7f346ed82fa9a72778bcf08396433e17bcb01ac714620d4039e44c350

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