Malicious PDF — malware analysis report

Static analysis result for SHA-256 74be7d306575b4e9…

MALICIOUS

PDF

68.1 KB Created: 2021-06-21 08:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 80564ce0c65ce1263142dc1c9c9a0d7f SHA-1: 138932e4301f3a4dd251d3b8d55127fc8d1d9174 SHA-256: 74be7d306575b4e931b96518792d65ac9886d0cb8d581978c5c69e04f1403c93
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 5

  • 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
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/116aac5d619f47279e4e5f0107d9616d/sugegowab.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/saxuvoze.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/813e7ca05e94e9b3c2900448bf7efcdf/fonesimemipudowewomijadix.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/tewefu.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/f3ncruant30cvrn1l1a0v9840r/58025219903.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/salutabugemuxasexebikelew.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/vujaboxezu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/df3b65aef9ea288aef0ebf6fc81d2ba9/jitixanuwukax.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/vodepevizuxuso.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/23519356086.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/laah3qpoddhhcd6cksj205e4pk/10077563840.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac70bade08---69944975356.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mixetusixefodipapu.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/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sheikh+khalid+yasin+mp3PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 5536 bytes
SHA-256: a68540af140465208e6c62dda166ecf1f31b0f23e89e84737aa615ee5c0ce6e6

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