Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc595de2ceaf960e…

MALICIOUS

PDF

192.1 KB Created: 2021-07-24 12:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 63f5469f671be7c22708906718c226ec SHA-1: 333275ff84e80e8963b3dd95fb8209b8be7c63f8 SHA-256: cc595de2ceaf960ee7e6512fcd022a7c49887ed811acb72cd47a73bca74b200f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming on potentially compromised infrastructure. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9617

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609715352db8b---28379976360.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc3949294---30318931868.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/32884990090.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/jivedovijerum.pdfIn PDF document text
    • http://scro.ru/pic/file/41639461088.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b4a112b9cbc19b6b427fda647e2a4ef/3866342496.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r9q548fe9t1jl6vgdlsu1fqnie/vavudoxesabovebo.pdfIn PDF document text
    • http://isgsrl.it/images/file/67348840187.pdfIn PDF document text
    • http://strandedtattoo.net/file/zubarixu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/t6jsq5kt21prq4ehmgjb5driij/lagodikinivuxim.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/82265330224.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b249ec74baac207756d6aa2d40d43277/verozisixijuti.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/44788428258.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/60977159089.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/48965498d74da747d434c7a476414ddd/gifowe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mol84pi38m2c94v5r1d72n4v4f/78545037359.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/mesoxovun.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/95442800929.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j5dudba97ov4j40o60ssc1k5m5/dapetupajuxiguwegelitun.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/judem.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947aaa7bcee---begajun.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb23736301---55965112514.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086811f117fd---mepogugodoxid.pdfIn PDF document text
    • https://svltv.in/userfiles/files/jurefigupuzodapesuwadiv.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e44228d7---94763782452.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a446c078f72---zegulezosefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+java+edition+download+for+android+in+hindiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B43 10680 bytes
SHA-256: 4da72ed45a01bcc5f5be4221af35034d30c939110ee6412e89faf986203509a5
font_01_sfnt_off000283ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x283AB 9512 bytes
SHA-256: 97db07c38f9c6fd44afc6a0f64b1012090794cb8449aa31cc7a307edde00e69c
font_02_sfnt_off0002a378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A378 20416 bytes
SHA-256: d1149cf6e84d48641a0bb529ea477b7bce3c3827f59e5587320c861adbd624a0
font_03_sfnt_off0002d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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