Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5ffbd2c4955d7e…

MALICIOUS

PDF

82.9 KB Created: 2021-08-26 04:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: caecedb1fedaac86552b8d5c3f83bf51 SHA-1: 65b80c62ef53123ab789332defed7446b24f14c3 SHA-256: 0f5ffbd2c4955d7e527985dd451c7c900e232684007dfe6e2b59a456374db1b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' or 'formcraft' plugins for file uploads. These URLs are likely part of a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c8813d1fad8a1ca8132075926d24f609/ragidevasalurujijowa.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/astte269vkhgslfiil53dfnb5o/70181483441.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1dfdf3d1---wibutusug.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f73699355---3717828495.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/rqi58qhm49tp66t1m6bo231ms5/48094197000.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/97488100176.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/047175414a1a04f07d2fc47faa8d6ef4/gezisotuxigomulilono.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/nekul.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160844b6b7c11a---xewipopowepelixen.pdfIn PDF document text
    • https://businesslife.com/content/file/45260415138.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faziwemozewodakonof.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/cv7lcmmr9cvldo20ebk9looo96/52690763795.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacd765b23---saloxosavefukulekavof.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16107a259acd5e---4188041286.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e888c77e0b---71656215583.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda47a7552---76716138524.pdfIn PDF document text
    • https://kermanrooz.com/img/files/40023478109.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/0tb3dcfitg8ja1h1e395o7nvl0/jojaribujak.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6417bbd68---56117983564.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/zafobiroj.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/69acb368a06a95119a6f922e44dcaa80/livepasejebeduvi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b33002c02f4---46128844309.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/2424176597.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c43e7320e9e083cba84ed52f54666622/75542860329.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210621014320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=indian+remix+songs+old+mp3PDF 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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 16844 bytes
SHA-256: fa3087a3c2f95c23386a2aa385fdca00c600365e6a3fa29a8f973f934492fcc5
font_01_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 10860 bytes
SHA-256: e0aa42cd9e2cc8455ddd806be0055c1d7d1d18b061ad91f05853341718cf8a72