Malicious PDF — malware analysis report

Static analysis result for SHA-256 55acf757ddab44c1…

MALICIOUS

PDF

79.7 KB Created: 2021-06-26 16:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 583753c7f97885ba108f14bc35518fcc SHA-1: dc231aa82b0d09221e0f0f4c02715bd6b1d29c37 SHA-256: 55acf757ddab44c1d9f8d13806eb2cf83a0d8af112f300973d658ed4c57c1df6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608abeb1ddcbc---33693649421.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/eb75f9ccd05e518f3dbdbe4945946eb2/jawijedajolopodojutumov.pdf
    • https://adikkedua.com/contents//files/badusinutid.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6d45909c9d0b63dd1ecdf630a00edef7/66530597536.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8svsa3hqmfg4rv2kvhr37pif67/vizodut.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/77080959084.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4342b744---28826102805.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160768b450f8ab---63253631114.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97ceabba0---rebezigakuto.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9a3644e2---serusurirobaragulelajopi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f77de27e---54016295914.pdf
    • http://hum-lucknow.org/test/fckeditor/file/84449357084.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41fc6a26e---9363921669.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/lelv3afb7peaq0lkbvp6nsmjkj/23460691849.pdf
    • https://alarrabnews.com/images/content/content/file/49613291809.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3e8cc1d41442533a96aafbc87305591b/53360620451.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8qivog74jc62ube02mip13v02i/kenixumuwegivetadanifamo.pdf
    • https://eyetracking.pl/userfiles/file/tidagaxifosifibirokaxolul.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee47a7533---35927600879.pdf
    • http://www.herbertvanderbrugghen.nl/draft/nelazanixemogis.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e471c80c5c---rumoditobizowuxa.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b2a1c804---79172223071.pdf
    • http://www.kilincsweb.hu/fileok/file/98534216885.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb20b3aa1---nitarizefirefevowig.pdf
    • https://hogies.com/includes/template/uploads/file/46924886115.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=owes+meaning+in+tamil
    • 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_off0000d3a4.bin
b5c6ce2a961da41fbec87f20f4ebfd597870008aaa6ef18b9f7d58d9211604f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 17732 bytes
font_01_sfnt_off00010251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 16792 bytes
font_02_sfnt_off00011a68.bin
11bf1d671ba55cffe03e8b750eb8c512be14d3a9ed5048a1cb091942f3e380b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 10340 bytes

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