Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87a384ed100d57e…

MALICIOUS

PDF

62.5 KB Created: 2021-06-17 22:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 951248c9a38166a2a4c56afaa8f4fd94 SHA-1: df47ab3d5df8ffc6a06a8b5080ec0fdae988a8b0 SHA-256: b87a384ed100d57e63e65af2808e5672552be2694bf44ac089da01e0be4b2e80
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination of the links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8027

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 http://autosklo.sk/pictures/file/wujagula.pdf In PDF document text
    • http://technocom.pl/editor/file/dagivuxasugixogufuzotakak.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079db8cb4afa---sidisijonadumivoki.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/4590253881.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd296f3e5---40232703175.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3507f037---gidonato.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/laxuwagadezufedirej.pdfIn PDF document text
    • http://cymagun.com/userfiles/fozidamobokixivefo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/m271b92vjua1q7gtlkm22e9cpk/kinusebit.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16083c445f2ab7---wezaxejibizolu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kasulifim.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/62675a70d1ceb4ea9690efb110951cbc/biwawodiv.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q6kdorhpbqcnkb9sve0c5slkbt/96463587281.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/6sk7r0bu2q9i8cq3dmheqhf3ec/liwukamedibevigamoxetupev.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8474c679---bezaf.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/ngfLrbzwjls/uplcv?utm_term=remar+quick+facts+pdf+free+downloadPDF 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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 5592 bytes
SHA-256: a042954ef9de1493b345fa606fdd47bf5bf2084ee992a95a5f6e5a2e56e96c65

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