Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cee9caa5caa8028…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 00:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ec6b89d10b757a11b52f8d2828dfdea SHA-1: f2221b6c048c78c5827099ab4bf2fc7fce1a40b0 SHA-256: 8cee9caa5caa802869f3c51259317a179f580bb57d93eccd6b07e764425b97d3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://melz-feu.ru/upload/10028818745.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/08fa0d6586032627e452e55576f70035/20781210490.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c1fe28c475ee210d6177a704756b4715/fesugifamotizimapusax.pdf
    • https://anmoul.com/userfiles/file/vutes.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609da77d3a228---gabud.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1e9dd1b8b4ba3db418b4075f6855f09a/41242788371.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bdhmp6f61940ha84etmnmqb4g0/nirivuxigugirax.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2086ef3a0ee09608ec1bec0ee37d75d0/1392848670.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adea15527c9---zedekikupuzukeg.pdf
    • http://giovanninociti.com/userfiles/files/xejalarewiduwus.pdf
    • http://locthanhwindow.com/img_duhoc/files/19558357628.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b9fa9e86e---jikes.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2s1cnb7otfke7nhc2emdr72jdp/nixexelozadabikagulakozum.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1a27d6df88630dbfd83d9840a0c2af21/miwegorajitavonib.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e45e7e1e6---pakoneruten.pdf
    • http://greenbrier101.com/userimages/67293735009.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/74601992757.pdf
    • https://area5srl.it/file/38957580954.pdf
    • http://skogsformedling.se/bilder_umeny/File/lisonetulitik.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fea39401c70979216a28084441475a90/25583705907.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/hh8bbpc8695i8sqc7ko7rh5eh1/wumiduzilaxomefedowaxuni.pdf
    • http://land89.com/ckupload/files/wumiwugezituzidored.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/45ec2a458a560970f113161cd1590359/nokedoxezav.pdf
    • https://rinducm1.com/contents//files/besowuzupopusoxifiz.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/63acb17fe2332eb3e909f32a4ca78615/sazuridilazigopiz.pdf
    • http://hrt-foto.hu/_user/file/fifaxiwe.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/279bc265991c1e31f54ad45d11693674/25795942545.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+bible+verse+coloring+pages+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin
83a9470f304e8d7b75020ab5dd66113c15cbf4b0eeb49173e1176d77cf00a050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16788 bytes
font_01_sfnt_off00011cc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 16792 bytes
font_02_sfnt_off000134db.bin
fe88d98dac236803bff97ccdf968a80be3c6cedeb352972d0b7b58df7ac96abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 10880 bytes

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