Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed796832a4f66a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-15 23:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6d6bcde1f4b7e33bb6b8883b1470037 SHA-1: f578e715347ca05f58c6d01fd888ca7f42f7195b SHA-256: 91ed796832a4f66a7ed58f5ec769afaf29395d876f5d88fce2f2dbd61193a531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to redirect users to malicious content or phishing sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=dream+league+hack+apk+2020 PDF link annotation
    • https://adikkeempat.com/contents/files/72357188654.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/55942325628.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/213691e82bd363e7ec93220a5862c69f/97438950833.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jubukolotaxalijoruweguji.pdfIn PDF document text
    • http://runhouchem.com/upload/files/somuketevadujixa.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/29999246648.pdfIn PDF document text
    • https://comfort8889.com/upload/files/suragedoxexiroxexuruxi.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/doxogamubazowareketugupar.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/7775879217.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/lulimatalufi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/11450867705.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/95344322094.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/garudenubufilid.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/mufujagorujo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/gejatobalire.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/564sj0q9rids3t07u10dmdjd86/jirita.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/48602471304.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/ludulozugel.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec37586b7---43668366626.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zulalip.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091023383922448.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a47300a6f9b858d3728ed9c721f0e7a1/munatetevekesekabis.pdfIn PDF document text
    • 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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 10676 bytes
SHA-256: 432c86be6185a3c5458fcdab291297f817048df1643d56be9c6c5ceb7c8f2fc7
font_02_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 14940 bytes
SHA-256: 0c6fe67681fa5bce8791516a086ce2b8e6d7c98d01a039d0f0f232b270bf8b88