Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24e5bc44f316865…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 03:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cdcac75648eaf156a953e08f4928089 SHA-1: 2e48d7644330dc5bbc4300e0cbebd9e003017bda SHA-256: b24e5bc44f3168658f3cfd54f67f1e7207c274113d6727813ba172fb4e4af62d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external URIs and link farms pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=measuring+social+capital+an+integrated+questionnaire PDF link annotation
    • http://akvari-um.ru/userfiles/file/34220426513.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/50504350435.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/davikakevusegitufe.pdfIn PDF document text
    • https://asiajitu.com/contents//files/19813586046.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/begafalatozimojoze.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/ramaraluzasadupesepasevav.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/niwaxowuxozijamekuvutisos.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/tunidenasatame.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/nofaxogajilerakujune.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/722e4006365ba5e3fe8db43165f7e6fa/8668612884.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/48215514381.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3r1stqh99lqrmpevefbgft5hqp/42943466774.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/24650588394.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/vepisurafulotowetowoseg.pdfIn PDF document text
    • https://digireg.li/upload/tifududojililulejokenifaw.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0bbjoqttu43ti8gnl7q75sadvn/69688728682.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/saledajes.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8p9gevkmfrpqfej26llsp5rn7k/12650332898.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/frqq1l6el09omv45b72d28ht0p/77535797837.pdfIn PDF document text
    • http://blueyee.com/upload/file/160801594015.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rerutof.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_off0000c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 17036 bytes
SHA-256: 55d914d2494f04a978fd7537e7d5fa8a30b15c38e5810119fb76af51cabc7615
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10928 bytes
SHA-256: 81682af0a3d7a5853da8d8fa1f0c1f0daa5c3503181e6de55569cf14f00b87a4
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1