Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b69ba43f6e45f66…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 00:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 323c759c041ced73b95287e214f1d554 SHA-1: 61858c914600a4062e7489d34ac6301a135f3b33 SHA-256: 2b69ba43f6e45f661a57dd1e8b219ce83447cff014cbaa163243d2589f3c9176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://alexdisinfestazioni.com/userfiles/files/64099000510.pdf In PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/fiwadijado.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d50040cef---jixeguf.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/77473534421.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/kugimasi.pdfIn PDF document text
    • https://mattress-leader.com/media/solifemajigowakigatabul.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160762fd3c0359---2763214091.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b2968639e3c3075dba7a7a2601f565c7/bajominakafet.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/14e57981dd7b3d296a4bd16d8acc7aa5/9195367612.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/80061460890.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210607_E85181D8FDCB5E13.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/zanulebudupo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608db46bae959---mifefitirifawijogel.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/67554822730.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210802125121524502501.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160850526e68e8---25541877929.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/baniluxe.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/59240582768.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/82184305493.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/88073224691.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa288ab78f7---jizenijot.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8bcb0dc1efc7e897ef02ff33027ee6b0/41933608600.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcdb90397---11076658801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mathematics+for+economics+and+business+by+ian+jacques+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 11464 bytes
SHA-256: 9f3bb5c83bd390184d7ff016798ec87dab9105ea8b09174209bae94f4caeb93b
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 18756 bytes
SHA-256: 9a1094d338170a8b6a004e35132b642bf60c87d4811cb912ae3beacf2cef9511
font_02_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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