Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb95f52a3dc3b18…

MALICIOUS

PDF

73.0 KB Created: 2021-06-02 17:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7052d3031654656576d833fb6ce03ae4 SHA-1: 89c82874e5141421bd87a426205b8abefc9b6ae9 SHA-256: 5cb95f52a3dc3b187b539d4ce6a502ddae2781ee432cc662c1a1647d795064db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to manipulate search engine results or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8hlp3hud6ncg7va3a5qcli1vs4/pofusuxuw.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1a523684---48513706422.pdfIn PDF document text
    • https://agatanorek.com/files/file/48685031106.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/63875ab9b962884a2fdd08d029b79a82/44089498104.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ramoladan.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8494967412ce268ad1545c039286bf1b/17339934986.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d9dc67e7---71039146375.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ca08263516b413f24c9f38c2f98528d/tadujelufanab.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aeb1ee9b1---30285988962.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e27333e8---kidozadubezozepobepirix.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/gasafo.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/gonokemojevifo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27aa9a189---gezosojemidixiv.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1550b083---47510873886.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f643b10d1---ledifexavub.pdfIn PDF document text
    • https://vestol.bg/files/file/dasoguwitefijawafasiso.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ad2f936d2f8---58123924086.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1d2c3fe5530d8c7d313f2a426d2ff711/mogadixudola.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/~3/1xuhb7AK25c/uplcv?utm_term=average+atomic+mass+pogil+answer+key+extension+questionsPDF link annotation
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 5756 bytes
SHA-256: 5436e6995e9962946162c31cccc20c38860a9d503d54cdf9840764908293a77b
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10996 bytes
SHA-256: 91fdb3582f7a2a5f836bbd0c483b4ec603c494b8e56837ac9d4f6d396a02b047

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