Malicious PDF — malware analysis report

Static analysis result for SHA-256 4632dc54d00c6a1c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 09:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: afc834c1d398a58614ac4f20fc31286a SHA-1: 50619513089d69a65405d2c6cdd5c2eecb661af5 SHA-256: 4632dc54d00c6a1c64347b61ccfb9fa1813b593531a2b056bf8c7d26f5d7570d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=death+race+the+game+apk PDF link annotation
    • http://qianxi.cn/filespath/files/20210915225013.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6d255ba60687de78cb14d9acb4f2fc60/zozodototetopi.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/rugutumuxus.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/lazurimoj.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/xezilugekagazaru.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/danefibopewibu.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/torugagivigow.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.pdfIn PDF document text
    • https://tsolisp.com/files/file/zawalakanexanu.pdfIn PDF document text
    • http://hailiaquatic.com/UploadFiles/file/vidatufilonagadugasafal.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rujitu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/pewanumumezosupa.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/muvejuto.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/40683320473.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e666e46585f86181f496cc0ab137e6dd/larupibusowopokip.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/fafoxupefodimima.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/degiwuwofuxo.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/sazimegewidevax.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e41043f1e---buzamoxavojoda.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/33141676745.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/gegezokikuniw.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/54700838793.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/mapesedazazosora.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/85826797263.pdfIn PDF document text
    • https://digireg.si/upload/tubapag.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_off0000b046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16012 bytes
SHA-256: caaf2788d61ed94bbe6a49aadd7ff15b5fa4ed7e8ffcf31f4c2e41fab752e32b
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10384 bytes
SHA-256: 3bd054597fbe87583a5eb36540b177a002aeeeedbd73ccc02e8087ba4ba46a44