Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb5ad24fefed467…

MALICIOUS

PDF

143.1 KB Created: 2021-11-13 18:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 402f8632b6a94f3d57c231df09d3c3fe SHA-1: a9d82559cca9c4be4064c73c7ad00ed50b36d2fd SHA-256: 5cb5ad24fefed4675a3e5a7590c3cd59353afdee53cf968dc0d631527f53010c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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=what+happened+to+justin+in+13+reasons+why PDF link annotation
    • https://aviatroglo.fr/IMG/file/mugipivokazubowifo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210928_181119.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/fipixedixagijeluf.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/musoxekexoxofasexozewilo.pdfIn PDF document text
    • http://puisan.ru/uploads/file/24082123135.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/labigarudif.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/ruzexezanaxunudowedilab.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16188882e97308---81066710833.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/naweb.pdfIn PDF document text
    • http://xn-----elcksuhhemsi4e.xn--p1ai/files/files/27462677459.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60df19ca72e2d42023783aff55c379a9/bowedana.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/21816051640.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617682205fce6---kudemedumop.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/27043729173.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/voniza.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68242762694.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/61414585075.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/lovenonasunujis.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/zebivizowu.pdfIn PDF document text
    • https://partnermind.cz/images/files/7921562180.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161899cd14c4f1---66738587399.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/63456976919.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/72775329574.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616c11c89a076---bofixereki.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/21175477939.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/46446659030.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_off0001c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C866 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0001df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF87 19968 bytes
SHA-256: cc7d4f9eddcd3cb230b45c9b74d0723f2c51944cd99ecdd4ea3f3c123405adf7
font_02_sfnt_off000213b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213B6 11092 bytes
SHA-256: 9d6b9cac3a789c7a93b4153b175947bb7e007682373583211bad538f850ea6e9