Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedaf1dc95fea918…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 07:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16415bdb642974e9e6f00bfb6e770117 SHA-1: dfeb1ed0998d2a4af99ac12883a5694bc58bbc09 SHA-256: aedaf1dc95fea918443f459b6f5e3ee71483f5ac766936648d5f8bf71fbde650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01a386a0---tufalokujuvurew.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/26c09dd40b29f272b294e0ef8e91cf7a/xazanuwodikel.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a4a64a64---83494838510.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/vadutiwomefogewamubil.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c6878fd3942754e16022a2b5ef9308a9/50019004409.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/51818690416.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/bogoduvinaravuputejexemi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c8c28dkf6vq2st1qcs1lr0h1ma/totuvipexomoxesodikipene.pdfIn PDF document text
    • https://koratspring.com/upload/file/zenupevejujadutizid.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/pelaziro.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9ebqtq1uj9gas0mvelqng2vjdl/xosiwurisa.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/63034537564.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b913910ee---vomegopelorevitufod.pdfIn PDF document text
    • https://eslms.com/userfiles/file/fadobupusoka.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160724393720a5---fosimu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/86522877951.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/85855067397.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210806_172143.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/10430955255.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/juderepojemizonekezul.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/fuwixez.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210722_4104C9ABB17B51A1.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e82e84b74cf957963bbd75b00b9c954e/2685184124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=el+cartel+incomodo+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_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 18500 bytes
SHA-256: 8bf15425f12b20db8df49bd08ecdf962305d2c52b62f905d0d12f84c35c96b0a
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 10596 bytes
SHA-256: 230f3b3b7f98898d6679c36d7723fdfe0cdcdea0e25eade55137c621d49f73e1

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