Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb467faa46fe46a5…

MALICIOUS

PDF

77.2 KB Created: 2021-06-10 18:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ca4ab19f9638f39d7ec76d41274ed6df SHA-1: d42d536facb955ae2ddeeda7d39d29757c1b2f74 SHA-256: bb467faa46fe46a550fbe9388262c35cb6fa79df912396d4f51fe3f1443e156f
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to scientific bonds, likely to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/uplcv?utm_term=how+to+tell+difference+between+ionic+and+covalent+bonds PDF link annotation
    • http://kythuatviet.vn/uploads/userfiles/file/pipevukurebus.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eiqshb9h77af2qejnal09l9srl/kelabojerulad.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607333674fab5---ridimololepemoj.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077935d2823a---demojoramimagatudoxal.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/bb210758b984d40cf700f578a4f982d1/wegejeliwuzulap.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04ca74481---wowik.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tifubamikavib.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608699f42f868---sewajab.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d551bb67---96316851403.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f979ee40---41829169919.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/93548727252.pdfIn PDF document text
    • http://aps-mes.com/files/file/vuwerojufizeje.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/36111579028.pdfIn PDF document text
    • http://juentai.com/userfiles/files/35834081639.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05679b8c0b5e86f388adc2d023ee68d9/vokipepi.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/xoxolipibebatovo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kc01gbkgoocenohphirbgnhvug/22014353006.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/96114609446.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050616552044.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb4f67aed9---79745562787.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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5268 bytes
SHA-256: c7e9d88e1613bc157075dd1bab23eb0ba403f97543617b8d3e241e24fdb7bc61
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 10716 bytes
SHA-256: df193d28927ff02527908fb65335239413d2fb3cb8293980f4fec2c2b0918a3e

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