Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd69b9a4b69399…

MALICIOUS

PDF

212.6 KB Created: 2021-07-24 11:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 929b7dee07ed3c7b2b8971ae9154f927 SHA-1: e7935e28b8ee7e7752b326f0ec35487b9210d4f3 SHA-256: aefd69b9a4b69399598987319a8709867ef1f72da5a695896c47c8f616f8fe4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to malicious content. While no scripts were explicitly extracted, the presence of compromised links suggests an attempt to leverage these for malicious purposes, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

Heuristics 5

  • 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.
  • 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 http://adaviestransportltd.com/userfiles/file/52635453830.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/86790694064.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5593f12e838eafb54515b7a131717199/84571704002.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/871d980619f1ede10b1b05321cf90b74/31216609348.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/basejazexowolizidifamuf.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da932ebd6---70912195417.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8d4e2ad0f90676e52b922ee87e637f3f/likofoluvagawamifuf.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7435d4abfde8fddfc2ec0e6c5995784/wabezalovu.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cff2fd4bd1c677c406e7f3d56bd062e3/39959217506.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/tukufekedojolajesi.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/91522842842.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609451cfdc015---dominogawukotox.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70ee091b3---fepubewumisen.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc624d907---57029910207.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/kubudanaxejolada.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/319908fed2fea548e90d9cd84f97f03a/doxizopesi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2a01b62dac5df92fc20d7faef93663a1/jusab.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/goroguvorugo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084abfc30849---71615597912.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a6c9a6c8c---35849676581.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jojugezowawamubizexapuw.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/51410129312.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608052d5270eb---fafamot.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48161363743.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/24011895899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=brother+ali+culture+room+fort+lauderdalePDF 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://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_off0002e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA50 18656 bytes
SHA-256: cb4840d363035b9619c45daf38ecfef3582bed2cdc681a6389c5abb68dc38aff
font_02_sfnt_off00032b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B10 10624 bytes
SHA-256: 7b727e1ee6db99ff09e8633896503b21d2d4577cba1f180c055351e02c3ee441

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