Malicious PDF — malware analysis report

Static analysis result for SHA-256 feec7fe20aa79db4…

MALICIOUS

PDF

104.1 KB Created: 2021-07-29 19:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 548ddb8a9225414afed696fe197a08f1 SHA-1: 7d7e7b65aa4f9525f6ddbd6ad8a8c1fcaaa6d208 SHA-256: feec7fe20aa79db487a70df8ac40759588bb739d31eb8087bb8c6476becdeff2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate that the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/tawibufakulenibej.pdf In PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/54246675964.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/jogifuvekotolapuxinelefi.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10160101862.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/62144906235.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fowina.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abba29c1a2a---salijolukanipex.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/20719936850.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/buburaxugowa.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/sozizipiwogezose.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/34720299808.pdfIn PDF document text
    • http://ezibra.pl/upload//file/19602177492.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a937f742870---96040049944.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2df8861f---55155498282.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/xaromegapabubitiduj.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/36231490121.pdfIn PDF document text
    • http://abpaluso.com/upload/file/39624819769.pdfIn PDF document text
    • https://purefeeling8.com/data/file/makudaguwokus.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/vuzonojirom.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160808971dbeec---bivavesovelesiwedirobane.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/pigomugepegubeto.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/lejori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+watch+dc+movies+in+order+of+storyPDF 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_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 17612 bytes
SHA-256: 0b7eb7c191d2716dff41332cc4d1960382d6117ef65171e799163b1a6b71591f
font_01_sfnt_off0001605f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605F 10952 bytes
SHA-256: ea0b1e83a2dc0636db7681f6af0561f44bf1b7cb39c1b9034772337b3241d62c
font_02_sfnt_off000179a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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