Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b69de2b968aaa60…

MALICIOUS

PDF

66.5 KB Created: 2021-06-20 03:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f1e49ff3147e982c9f8054a1a156699d SHA-1: 5c26422d6a9d68b0397944fb1eebddf91a17c31e SHA-256: 5b69de2b968aaa6066be215abb8f2a017ecee44c18ca37d9856a3531bbc5efe6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

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://nomylo.ru/uplcv?utm_term=shatta+wale+alakpator PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c1b1a01cb5bfb9e6a3c3ef28635813bd/8734766945.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16099eb2fbc02d---84310394152.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/nurekidodepudo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/99617524737.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/47039834400.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88278556460.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1f94568614927f933f61864ec22c1068/70007148684.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h7scpu67k6887u47l5lp83iae2/49960031156.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4l0nkrr81gpk7ubra83a84ugi7/45546174661.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/sujokasegawoluzusele.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf6ea343b---61412578456.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/56113839d51de049f812c1bc489ae109/wobupagononuwifamuvarewuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 4988 bytes
SHA-256: 69d08f4438424cd03bcdb72f81df6894efccdd02a9cc2de8a849b39afa3de0d3
font_01_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 11708 bytes
SHA-256: 9b1d8179085e7cff52022125b041b63303dd8b74ed9ef89430abb31a9e3177fd

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