Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb3979e30c59635…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 10:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d6ebd4a4c15548480730daa1fa064b2 SHA-1: c4261ab75a1b36dd2799fd5857dae690641f8c6f SHA-256: cbb3979e30c596353f6500ee763e8c06e4915b1c72a99d35aa848fab8bd22b7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and others forming link farms on disposable hosting. These elements suggest the PDF is used to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=pokemon+sun+rom+download+android PDF link annotation
    • http://inspiredindianfoundation.org/uploads/zumanesojenilumobalu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/5370165923.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/17197187463.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/52442722310.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dimikapapopidufizolirosox.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/zokanizenez.pdfIn PDF document text
    • https://premiersuli.hu/files/files/banisuzulud.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/nogefilovok.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561fa865119---42744703913.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tasitarojuwuvejunikuloli.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac07b68131---dajivifoguleziman.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sadude.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210921024757.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/nexeja.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/35993358585.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/21089022075.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/tozitigupulijugizafekuram.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9c23b98d7d06e226a619ae97eea9d1e0/sasanofefo.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/14602164400.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/20990132778.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/vakulapebud.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/koputogelamum.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/38016370322.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/28761122565.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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 10592 bytes
SHA-256: 7576ca896cd4d5107b616b779da1c35e5b2b9b794907e15a25aeecdc9e7d8875
font_01_sfnt_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 16468 bytes
SHA-256: b24656f92a05800d4319dc5984285281ffb6c019cab8ed37f276752c6106e322
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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