Malicious PDF — malware analysis report

Static analysis result for SHA-256 246aed05dd4c83e1…

MALICIOUS

PDF

88.9 KB Created: 2021-08-12 11:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9d94a2966e322f6d34db7b215930339 SHA-1: 6c0a5a07fcd3ff8f066cd56a3836aeed32358eba SHA-256: 246aed05dd4c83e1370139937d13cbe45e4ea684da8098d0392566fdfe7dce9a
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of a 'download button' heuristic further suggests a lure to download content. The primary attack pattern involves directing users to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://castanienfamily.com/clients/74558/File/xafuzawekaxixazurol.pdf In PDF document text
    • https://unibel.pl/pliki/upload/file/kuribiwekaxelufakufesa.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8cca6713800b711779453c25cee39067/76273611862.pdfIn PDF document text
    • https://seikico.net/img-tym/files/wuduno.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/79009078644.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/12656453589.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/nulopavoxiligepudavudotuz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819a59a2194---21004505813.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8022ahc4ek8p20s4r9q11njh01/numoxuf.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17728852029.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ab03b6e3d76b9f73b6958df346e30324/vivelopitamawoge.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089d564da5a7---palopikib.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f761a1793e---wubetegipelosuxuxev.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/gotokoko.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/e27qhr53b17kcsu81fih89ale4/81298806158.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/229d83a9af672610b8519ea390b7a623/ripowifopixo.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/xagaweze.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7624a7c22f---pinijerifigapomumapivano.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/47414497261.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608480dda286d---93952013454.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/71831527789.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/83757698432.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab71f4a63b---jexeluzali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+garageband+for+android+full+version+apkPDF 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_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 16812 bytes
SHA-256: 96662a0a04bbb8090b0ea1637d24912f7e656f51c184a496d6fc80cfdd2eb65b
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 11060 bytes
SHA-256: 338efdea6d704a8bf1d6e6fc7ddc7289c1a8704389ee12b063f675a9ce4c3796
font_02_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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