Malicious PDF — malware analysis report

Static analysis result for SHA-256 5788e689530c77b9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 03:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6ffbad779c6714c69c0ff0f245a7728 SHA-1: 964c7e82db101b368d6679e1f41e8872b451d47a SHA-256: 5788e689530c77b978d825de4b069df07dd0041564b78367aa83b04ed4255b95
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9424

Heuristics 5

  • 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
  • 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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fbcf204f2413ca18acfa8079b99dfe1d/43223826558.pdf In PDF document text
    • http://abpaluso.com/upload/file/60819955516.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/51238913290.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120d445ceb73---93427387782.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wejevet.pdfIn PDF document text
    • http://erictex.com/ufiles/files/memetu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rlf29ej1n3dvqb8kk0erqr283b/65625575711.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/litatotitadafaku.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9a2bf56a8c518373f5333290466ae33f/97474926640.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/96989360614.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/44802946165.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082008c198df---82204283758.pdfIn PDF document text
    • http://pasted-radio.de/web/files/jonix.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/giziragaloxenatunegewile.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1umemp7f191genh630fsgk1073/45525442761.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/wegezojevoledulo.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jibiku.pdfIn PDF document text
    • https://menu2uplus.com/images/file/98978522213.pdfIn PDF document text
    • http://expresskaliski.info/file/muwopodebusewimatoz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00bc74ce6c---kojoga.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5cc8c6ca---85329265460.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/siweb.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d58d5d12---piviberoxagi.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zowusamefaled.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5blc195o3hcdu7pb3pfnvp5601/87416978753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ark+survival+how+to+tame+a+pteranodonPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 19016 bytes
SHA-256: 75b8dd20346b212e3de96e8bd6683e996d66e23f7529cbda05ee9057f5db1bab