Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaf6ce0faf40d46…

MALICIOUS

PDF

75.9 KB Created: 2021-10-16 04:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f323ab17ef7999b085f2aa7af1f6a884 SHA-1: 831bb5a6b5538dd46079b7f046c3b053d29b590f SHA-256: aaaf6ce0faf40d4640edd338146555b540b91ed982978fd5c1d8010f68fa4bda
104 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains numerous links to compromised websites, many of which appear to be WordPress installations hosting malicious files. The presence of a 'download button' heuristic further suggests a deceptive lure to trick users into downloading a payload. The document's structure and the nature of the linked URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=csat+paper+previous+year PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc12e403a9---baxirafudexasib.pdfIn PDF document text
    • http://labradory.pl/file/62469994876.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/92400910970.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161630fe9afd13---65475534861.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/xasuvajenudibot.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/bogin.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142543fc6b3a---wazajotosuxefovozi.pdfIn PDF document text
    • https://medpressa.ru/files/file/62409850188.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/bodunuduzefalezig.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/1878045341.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/33372048654.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/rasubanejivu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9f5e87f4---82891617989.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092219502684.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/virevupigaxisovosufageju.pdfIn PDF document text
    • http://staropolski.net/Upload/file/50424079681.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1616a10c26b8f5---fawukabusudugulode.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/vazikemufexedevado.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/rapemibemebesaziluzubo.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/63152711427.pdfIn PDF document text
    • http://koutingchina.com/upload/files/63933860158.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/37239633246.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2fc0625df659f460a5e8374542bf63b0/3445231138.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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 10408 bytes
SHA-256: 8930e30de7f60c63802585ee217d6b388944b06b91f305ffba1c1e872b9322e8
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17184 bytes
SHA-256: 82a88a88d7a1e927833b0cb6bd7e1fce8aeb96c442a12b3e4dfe55db6b64d2b9

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