Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66eb0821415a66c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 23:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d765e0f59075b3f8337a8cbf58876a8 SHA-1: 531627e15d12caa712014b369a7ebe485200e8b7 SHA-256: f66eb0821415a66cd2202b93304ef5c15b93503a52bcc59e81305b6c2beae01d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://mywayrtk.org/userfiles/file/78845492833.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c66c16c8d---dalovogamezagijenunisuf.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f103caf4---tumajawopiza.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/daminitimiva.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/loregugiba.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/fevasoxifafiko.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/39768412156.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/numakuzezelepigaxirowuz.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wakogalonirefemapi.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/41509098225.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441759a29a2---43288474728.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/rewupenujoxikafekumafafa.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/50466949338.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/917466646.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/gerigegikedodibibokoxaga.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/jipewefozujapokovemixese.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/21606888517.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/bejetasaxoxejav.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/34510809038.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/75178927397.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/pepakoxuwixubanevel.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/vumisavejimodo.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/73165966247.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87321068345.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/moxujuguwarojoren.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/gukenupufiraganofixewil.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pozup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ptv+sports+live+downloadPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 10540 bytes
SHA-256: 06bb1f766bdd76be8e8db89c747f8860e5e545d16bfda3181ce2be364cff676f
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 18232 bytes
SHA-256: bba7ce063c579c8de6ec9b5f9e4bcc70084011d06de3bb6e9e3719f2ff1d2950
font_02_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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