Malicious PDF — malware analysis report

Static analysis result for SHA-256 282f9b48955bfd2a…

MALICIOUS

PDF

77.9 KB Created: 2021-06-22 13:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e331f79d36f5860e55a089d6578e9934 SHA-1: 44d88bf34c073d9a201fc2cb49325a9fe778c6b2 SHA-256: 282f9b48955bfd2ab63a936e0e11ae2e850b022943a3f6cf99ec8ed968267f0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware. The document body, though partially corrupted, contains text related to a 'Windows 10 enterprise evaluation activator', a common lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/p5h22f7li2b53cjotmv6bk9hnh/82294113413.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9520a56a07---12982992974.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/23250983414.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cc58a0182e2789e00a9b7da27097f8d9/1682461524.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lddi3vtpjb7f1nhrukm3hrt90n/dopuwewanigafov.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d7859260---58428629508.pdfIn PDF document text
    • http://goref.ru/files/file/wolipiwomazul.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/44985fe73e6005a8f65373c7cfde931c/sugamuvomujajaxa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732e333851f---16024285528.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zezegenusuxag.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf99de8e29---rijexowovu.pdfIn PDF document text
    • http://guowangcable.com/d/files/wumulufuzikawavobomewo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7efb4bb70---86608860046.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/bebabezurijison.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=windows+10+enterprise+evaluation+activatorPDF link annotation
    • https://answers.microsoft.com/en-us/insider/fIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 5308 bytes
SHA-256: 420cf88443f85291fa51383694067641f54dab27e098620c43ac65bd7a3111f7
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 11576 bytes
SHA-256: 2565615b88a843f932cab4caaefebcb26687bc16f92add03ff637bb44fa48e7e
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2