Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea12cf7a2d39cca…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 16:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b93eb1344831dbbbcf820caa8b7efc82 SHA-1: c343493a81888578ea8c813b29a5ad179f0955bb SHA-256: dea12cf7a2d39ccac586a72de91a3d8b8ba689388789e49763c6143891200611
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to distribute further malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=day+dana+dan+full+movie+online PDF link annotation
    • http://hotelbelleepoque.bg/userfiles/file/puzurepimofew.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/36724257626.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/10429140677.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/12344390513.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/setumekerof.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/93554360441.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///45597968269.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/guzasovopeki.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/33984649015.pdfIn PDF document text
    • http://balalajka.nu/media/funugonenalikarugedirub.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/jokevedurosola.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4d7bb1a4---99897125667.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/widatemimuzewulonuviroluz.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/xibur.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/33836662404.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/98668886391.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/vagemipopinutajuwu.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/zakotuxazagufobuvugo.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/pobofukiladu.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/fevexozudodujatepasen.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_8066B2F837ACFF47.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6lkqpsa4n490gvoajdnj5jml7j/75600758992.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/28191996561.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/xububokazod.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/logarozaweruj.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613692cdf0582---finimulasawawebesuw.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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 10428 bytes
SHA-256: 1ef8194d1f38f915522c269da5ed5cd7872b58c1981b76c0f0971d2fd636e4dc
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 18116 bytes
SHA-256: afd50cf8eaec469b3664705bb18232bfb6bed62914f9866658d40b4937000669

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