Malicious PDF — malware analysis report

Static analysis result for SHA-256 3201f67aeee7766d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 23:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397cc2c238104c50ce38a8656c3602a7 SHA-1: cddade99191309ac04932b2e12d44287e67bee71 SHA-256: 3201f67aeee7766d6cfcf27ec9dc5e7181676782a7f97d0c983eec5eb38d3592
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c6ab20f1---66366549889.pdf In PDF document text
    • http://archerelectricsupply.com/userfiles/file/vuvinuvopexosesigore.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/febobupev.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/pusareze.pdfIn PDF document text
    • https://conrays.ru/f/data/85428975710.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/togunawekono.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/sixupavezuko.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/kekifelugutozo.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/wedowusepil.pdfIn PDF document text
    • http://coffee33.ru/archive/file/69586528038.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9vphts4obk0vl5f0sb5bf85rc4/76750677403.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/vusurobutikoxezevedopu.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/33313675583.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/89108823710.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xosamadugezemawibobabi.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/podixizesugorose.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/sisoxuwazenid.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdfe784b72---voradawaxudemip.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b9d04212be54f4dbf5d3de9f96b00967/faguriliganojimasa.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vikibudelifabes.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/teradogotezudewumano.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/81782957951.pdfIn PDF document text
    • http://byecook.com/ckupload/files/11638265532.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/73284589853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=m-audio+keystation+pro+88+manualPDF 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_off0000b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 16588 bytes
SHA-256: 92e80034403b217af839de1aae16d4ec12bc0aabbc7182559fe47117cad19eed
font_02_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 11096 bytes
SHA-256: 306c59033e2a1314f47a30fb722fd6c8efc9e7e4842680f76932424ecee0ed66

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