Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada335788af413e6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79b9bdb40fdb5592c7d10c3b17ceec84 SHA-1: 85a5096a0152bc6662c5602e08d387debc55031d SHA-256: ada335788af413e6c5e00c24e6923aba25466a7d100f50d0eb91dd4d7774759b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a lure for users seeking file conversion tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=foxit+pdf+to+word+converter+free+online PDF link annotation
    • http://ok-poland.com/userfiles/file/vitemofapolamulimigasi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b202bc03a63---32865003646.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/nepozesorojawem.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/puwal.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/16429892329.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/30525308152.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/dituxojixo.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/xumezukomorezo.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/nadotemekikiveji.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/foxoxiditobufinimopi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b597ee6f182---18408747898.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/v89og4pce176lja8v9e5vac7q7/gabumak.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tefogemipiv.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dc8178d2dbe7c5c915eb3bd83c58c0d3/54100713798.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3a8b7c32a3f735b300714fa8ca303b93/4744496082.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/bikagox.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442f1a70ab---34135163172.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/71016063342.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fawes.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/26283946319.pdfIn PDF document text
    • http://aweibel.com/Photo/file/888943610.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/piwivubexi.pdfIn PDF document text
    • http://cpils.com/userfiles/file/92402594274.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 17160 bytes
SHA-256: a23a62be1513bc19aa5ab5f6a15047fa04c4a74384919d485f6be4cc2cfda3cc
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 10512 bytes
SHA-256: b8c6b8ecd8fd0bcab9e055d3a1e224e1def32b9eabec3325cbea15c41a2ca052

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