Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c88d51d6eb24eb…

MALICIOUS

PDF

77.6 KB Created: 2021-05-28 14:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1f3590eb77d73ed8728d2c6d6dafa794 SHA-1: e1d1e5c3c7353d2e12e896fc4b56b3bb1f7e611a SHA-256: f1c88d51d6eb24ebb3674f5cfaf94686d6b29eb89baa780a151c5ef8692d7b17
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. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The document body, though heavily obfuscated, suggests a lure related to 'file explorer root browser mod apk', indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=file+explorer+root+browser+mod+apk PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608febe5799d6---bupufafamanepazan.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/2306094254.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb0d6d7ba---6645957322.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/33102599588.pdfIn PDF document text
    • http://arslanemlak.come/file/77454388826.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160946845e4973---39793551627.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d9911835652ec4c5957528b7f418267c/76600302469.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884abd387e5---38858194351.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10ae6a710---vudebomebefesusir.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb2bb96ca---27492419731.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2f3f1cbe816665684686d389f0b05825/dupepudowojilidu.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/26197236561.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17898527b---lebopu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a74bba7614e---wugav.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/roletajijipunekixox.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/55f673e44710c33cad46a90daedaacd8/tisajebi.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/jotinavokiwubame.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/96557940731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 5424 bytes
SHA-256: 1bea149ea64d585ad69d19283a2746cf26ffead99d2b06256c5272d1a97a5395
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 11796 bytes
SHA-256: 0c413a68c5baeab58446439d8c9ac549121fd56d7c2462c2e5caeaef88fab958
font_02_sfnt_off00011447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

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