Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd5fbe0a6023d8e…

MALICIOUS

PDF

82.5 KB Created: 2021-07-08 02:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dad16913ae54c0f81240c405a8bb857 SHA-1: 5355df444166feaa2332b62317b50fd3132ae00d SHA-256: 2bd5fbe0a6023d8e5dd34bdb6b84e6712d56b5aa7144dab9c65e31a5492df35d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Numerous external URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or lead to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crewmak.ru/uplcv?utm_term=new+mp3+song+2020+tamil
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ms07l9ndu4e7cbnc5bsirti4o6/nemapizevafitonorutawo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sq22k2kglpfcad5l7jdp1di78u/gikesirapigowugalemel.pdf
    • http://ge-mak.com/files/jesevenofijirugeteruv.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/jinubusebunazutixetegem.pdf
    • http://www.contectrade.hu/fckfiles/file/15220012515.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a52cf60d1c1---27910597992.pdf
    • https://sealskinz.ru/files/file/21208517011.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ea84319e---75192973628.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2878803c---23484144388.pdf
    • http://driver-jazda.pl/upload/file/32654783672.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a7ddd8f79879b08cacf6c5da8cfe335b/85815800297.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/toleluzetabisosibazune.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b68fcb3ac---bopixuguwo.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b19fcf467aa---fodolakapukanuvato.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4227a5563---69034549526.pdf
    • https://bandotrading.com/uploads/file/vabapakuzisedevoramov.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e5dd00bb---34554042047.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t0pns7gj5ci7slgvm3iu96d2d2/37394433477.pdf
    • https://aslimitada.com/userfiles/file/66486642035.pdf
    • http://parkhigh65.com/clients/4970/File/rusepusolunu.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c386ddd88e6c884420451d733e92c97d/70924763713.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ab93987---41563054865.pdf
    • http://almar-bus.pl/userfiles/file/limole.pdf
    • https://giorgiosantinelli.it/file/93753748479.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbbf9efae---vetomabevosi.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083641b9d1dc---luxuta.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/cjkmnp2bv1gjhii8fqvaqo1nv6/18493424616.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_off0000de01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 16792 bytes
font_01_sfnt_off0000f613.bin
267e65efd17a06d333b94524ab7c5fcf6590de1cf78a4f7648337b25bb5ea3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 17300 bytes
font_02_sfnt_off0001234b.bin
b11b9974080bcf334c670f7734169450f3b00c88593a593b1372d0c8593282de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 10972 bytes

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