Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bad0e3743385a79…

MALICIOUS

PDF

73.4 KB Created: 2021-06-19 04:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: da0a313d9f5c7ba1ad035ea4345452d4 SHA-1: 047d8b5c6143c6dd50c3e01533b9d4501e759dbe SHA-256: 8bad0e3743385a79dc492d1154abfa1e1a5168a944c513a4c4d4cf939151460e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mmszke.hu/files/file/18062217448.pdf In PDF document text
    • http://clarksville.net/wysiwygfiles/file/xineruzabebokavitovu.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/vinurezelazunenibedideriz.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1587e5c42---67767703612.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/xokosajubawa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991e13d00a7---28937223784.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mvu4nr3pn0nivckaso40h287oo/miteliruboresuvewowebodu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/porovuj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/421568e7432f9604f453f24fd7dbbbcc/vidoj.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/41853742483.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9c46176e---pekugi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3lr9bojvupuv2ujjr3kpn0k0g8/fiwanesovatokal.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/31239951324.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/fefamufuterovezegoduk.pdfIn PDF document text
    • https://noventa.cz/media/files/file/14351573815.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/gopifebidejadisanol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=guided+morning+meditation+for+healingPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 5176 bytes
SHA-256: 232dcee7530b36f78abe142f26cac29a7424117f74a061a93e8d812bc6924b84
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 11004 bytes
SHA-256: aefe72322e542d31674b2290851b7fc7e7d296d3484b566b5a248abfc80d8c76

Open this report in the interactive analyzer, or submit your own file for analysis.