Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7fc326674bf669…

MALICIOUS

PDF

107.4 KB Created: 2021-08-02 04:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: af7051ea7385188ed9f4fa09218298e7 SHA-1: 8e3d773a188e170fcb63e3641aa0546a112648f6 SHA-256: dd7fc326674bf669632e386a3f038a549b3cd8d300f4c0870b5cc5f16875bfc6
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 compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://smidgel.ru/uplcv?utm_term=surah+fatah+full+pdf+download PDF link annotation
    • http://detaycopymatbaa.com/userfiles/file/mesaxajotusibapup.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bjo2bh7dpa19ud6j9e5ck88en2/kukafogumurajamudozokagir.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/73295391830.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/bfa94720848e986715180b41f75361c4/kudevaviwuremevijunukuxu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/98395821887.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c7be51a98fb38f31e05014a4d5aaa7d2/repisogufetowex.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787f48aa448---10459405558.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/782a1f2380323b78ffecb71bb3152e17/24625334127.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/sedetiwunebipetu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/funebadiz.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kixejonuvuworovawado.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd41ae109b---62464423545.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/tenonaterajegudijo.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zizimejixanobiridilubud.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/nn62s80gb3nhg4ea16f1aq360p/21882124297.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608e473f751fb---17481225617.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/t6ahk6rugvrdgc4mt71esj4rq2/99878955250.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/88304938309.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/721eef61a3346b8ca11b3ebf08211b2d/23829048665.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/86914284416.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/48694167299.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/musud.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9ba4649c---26322665264.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b641e0a662---79627146624.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/28701940107.pdfIn PDF document text
    • https://agermag.ro/mm/file/wosaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 17500 bytes
SHA-256: 9f7f6d88b6f118356f086b443c07bd29f42f539c3b8271b804c8bd186225273b
font_01_sfnt_off00014329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 10464 bytes
SHA-256: baad1a0d0f94bbe70f30bc50dd45fc5831556ed6dc3cd3a3372e31654fab79ca
font_02_sfnt_off00015ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE3 16648 bytes
SHA-256: dec1fd1aef24bb929f270ce5798bff1061acf8b3684568a04d205fba2bc527f6
font_03_sfnt_off00018647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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