Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b9fad4f79e2115…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 15:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 512ae032ec2d9943fc955e7a3259c972 SHA-1: df485e609f5a7e2656706a8b64f26ff44af3ad4e SHA-256: b5b9fad4f79e2115cdd7a23ec9a6cda3734ca72c40c03d1080e261b106d7eba8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or conduct phishing attacks. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://globalcenterhotels.com/bot/ckfinder/uf/files/86790507526.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d7c7f2b9f894f74cb82a862c8510804/xirizijezo.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82757461783.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/65873002424.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/fejet.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090615520073499.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/bolakuxugikakufu.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jezomesedosomuvup.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/idja0fkamq60jepiimvsj613i4/dejikupujeju.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kisesil.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/87246907804.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/aaf600e42834151a677f946d0c0e07db/66294947486.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/19028866711.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/motekemerafivaxoranasuneb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55f4dada---67282099164.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/49950307494.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd421131c5---84467075995.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/figejupumexetibe.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109031302171895.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/diwetixobazopame.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/18519082907.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/negeforurafupasiwomifoful.pdfIn PDF document text
    • http://ge-mak.com/files/78242371528.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/vumaraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=main+properties+of+acidsPDF 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_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 10560 bytes
SHA-256: e6413bf3ee419bec650bccbc1846fccaa058753635a138cb617c3c17853c716f
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 17188 bytes
SHA-256: 2b718ea250259c80acf3c7a74b6dfa97ea7033d0d80f757dd9975a460be2f30a

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