Malicious PDF — malware analysis report

Static analysis result for SHA-256 f694f0652d401dd0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 20:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9ccbe7e932cbad0a1c7b16ecae73617 SHA-1: d1ee864621ae73cbcffe94e6e50f5570ba1fd1ac SHA-256: f694f0652d401dd0c4f29b17f29bc4fda930b20b82723b8cb3120bd3875429b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate malicious destination. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicates malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://garglob.ru/uplcv?utm_term=icse+maths+book+for+class+9+pdf+free+download PDF link annotation
    • http://scbczy.cn/up_files/file/20210611_102557.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tosuzesikopejukalav.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2a3f0ba1fd6aceffb8ff183908103fc6/6564610719.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pasewikagib.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/dobilabuforuzo.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/58453907533.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nomosegelitogede.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210811052409.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1bc46243ab9cbf4d0528b08ca97974d3/javesowu.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/rulusazipavi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48a00ff8a---16216846976.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/bidomepibedagofutepemano.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/78680273671.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/79739113242.pdfIn PDF document text
    • http://aquatherm-graz.at/files/benemu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vha6sapv2fv1074bp00f6s5s4e/xuwajikawamewi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/39051851692.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ak6hi94jfb3qkfa6bkdk8h00a4/buvatelejimuxadoxel.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/lizederegorajutew.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e0a6ab8a5---wasipulenojepa.pdfIn PDF document text
    • https://togeltop.net/contents/files/58472060256.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/12901384191.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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 11228 bytes
SHA-256: d182b8fe03abf4c56587b3911e28feed8fdf165d4572c57e275d44b7e0d0ccef
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16668 bytes
SHA-256: aa139f8430f5202542e505796592a1811f70555db148bdd074c309bc6ea792a4
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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