Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50cf62566be5850…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 16:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3b12a9356b9c66616c5f74cfb432fad0 SHA-1: a7bbafb6fc4b3737966e7aacba3a7f5dbdfd2768 SHA-256: f50cf62566be5850c5760e203532a3578c47a08c2df10d515b70b5880e4cbea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d89c5b12d4d43e37d0d25e47e00f615c/19814479111.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac796e441dc---15229528400.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00256ce878---foxenopupevelugevamuzifaj.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4faad98cea---xobuzaxarelevobo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/efdb09cfc4dd5de391cf15f1c9d41568/28024274039.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c0d2bfd4be67c0e481e9231eafd4e74b/topakoriludad.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/80387834678.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63cdf40e1---25529520576.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160944a33c5790---5139422969.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/lomufoz.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43088932642.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/54296173062.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/52634298976.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/51fbf4900b55a68d896064b30cf5acd8/xagawoxobelibit.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9348e503a---3998757744.pdfIn PDF document text
    • http://splogservice.ru/content/file/vufofuvaninotapuxisifujan.pdfIn PDF document text
    • https://corghialberti.it/file/nigomire.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/dokiw.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/3792359094.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/99193478161.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/sixejedadosorazi.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/tesalegilene.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb6fab0c78---loxebodejujunedufodanomad.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/keniraxugefibizetobawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=civil+engineering+rcc+design+pdfPDF 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_off0000c210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 17028 bytes
SHA-256: 62cb96572c77e290b97109df55eb6e956ed8b75b2426d65c332184d7caa72b49
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 10512 bytes
SHA-256: fe9e67220b55efa3dbda8f9dc8cba51e93ba8f3847eef2d9a7d94b6cf8029de2
font_02_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1