Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0be9863d7fc81e2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 03:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ea70f2a5eda2b03a6de12259f03da3c SHA-1: 478787eb94358d29af8f350d4280a40330ca86f8 SHA-256: b0be9863d7fc81e2e853ebdc74af518d4981fe8c318828a72512cc2069cc9526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various external PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://muahohangnhat.com/app/webroot/uploads/files/labarugo.pdf In PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/11639671754.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/87997344023.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/13dd33b4e1643b40e0917d35852a9194/kuxujeginipaz.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/kimakixaxolidite.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/gadubutafixawirodiked.pdfIn PDF document text
    • http://pneusmarene.it/images/file/61395804234.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/37312600036.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/koruga.pdfIn PDF document text
    • https://upaspor.com/resimler/files/segekawavunukul.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/63476737585.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/buxemakavewugivexab.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/fofinixeremo.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/12745346868.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/40iho4c9jqud5tjbi77roj001h/ladopim.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/121802732613fae2fbbff2.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/75532098081.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/20426400899.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/31262256999.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/fonomi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1ff349d1---depixano.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/56191774807.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/mowabugemudekam.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451d90562b7---jituxorawojosamenofuluvik.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/mofanegarufenugowawixalaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=insta+account+hack+onlinePDF link annotation
    • 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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 18492 bytes
SHA-256: f7e8ea590b38021581c8a94d3996170c559d641aa84dcdf497ae33e01cf41818
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 10368 bytes
SHA-256: 1847bbd638016aa84ae5881b9cf13e58e7d81fae475cd27abb80154b60bab34d

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