Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafb3af1f2ef60c1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 10:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab0d71d9708e88dbb4936f74dbf0738c SHA-1: 7757fe459f014115b0dcb984f6876205310527d8 SHA-256: dafb3af1f2ef60c179cd03bf5be730f1d3908b7e2c2d1ebcffce6a299a3f6126
172 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various domains, some of which appear to be compromised or disposable hosting. The primary goal seems to be to trick users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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.
  • 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://telewebmarketing.com/FCKeditor/file/bajejegivavi.pdf In PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210716_8D25CFDC11769060.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/74106260406.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f377a9d949---11506029711.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kapaborezonegapitile.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/luxunalunotomozavafugu.pdfIn PDF document text
    • http://axwelindia.com/uploads/fotunabowi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c21b24ee565a9279b8c4d59fe82c0e93/2210439707.pdfIn PDF document text
    • http://cmtsport.com/pliki/suwamujotojo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/41d7237f3b9300e047afc255628043b7/fenanubasotunexef.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/38694509774.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/xafofajilug.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/63779565507.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q6dal50dfr26ae9uhd7rfm8350/87316842178.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/jemonujib.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bd1d50339ac962443db28980c4290752/83945745212.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ecf8efd51---35998762789.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/gifepeludafovukul.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/frlqqifilsosolspaq54kfnfh4/22006053511.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612af7d76edd8---26332797651.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb80c39cd5d---22725248946.pdfIn PDF document text
    • https://partnermind.cz/images/files/10936825934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=healthy+relationship+wheel+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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 17748 bytes
SHA-256: 9dd59e9848a26a8a2ff211a728806db8f58eac52abf1267bc229685dffb41a0d
font_01_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 10788 bytes
SHA-256: 0414625356cb41bc2aa92ed82e42244a2c3d50575bb9224ef860294f5fc6a1cc
font_02_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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