Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff41c68b61e68a72…

MALICIOUS

PDF

87.6 KB Created: 2021-08-01 02:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a73a4216ac93a343f3c07f12202abbc0 SHA-1: 725e7aa5425d4044a4f67b7d2d57c87696391b93 SHA-256: ff41c68b61e68a72b56964de0ac6adb15528ee60d99f6caec37f66e0b7a2532e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirects, suggesting an attack pattern of phishing or malware distribution via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://dashoernerboot.de/userfiles/52377519225.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f24941667---gufobawewizupogakiwagezum.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mopizikotis.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/357187548.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mapejajigikogudukab.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/1nl4mps01p8eudugq37tbt05d8/tamanefeza.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/64ad713edc7a1ba950a900c5df70aa1f/41172294323.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i9g3jftsr1k8bphsafbu5sjcv3/pilulixejo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/74505621359.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/80923878425.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/81517099454.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3f696c4b---78601912284.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/256b9dc5ba887c7460dffbece42edecc/55145983251.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/37kfii5buec2ar9esdgsnqdngu/27156059744.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d05bc31a0cf2dff23107d1440aec628a/nivupebawoxepuz.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d3e93edaadabb7ec92348bfe1d81bf6a/tobigedipadixexedawemek.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/50701376651.pdfIn PDF document text
    • http://asustainable.com/global/file/nukukevisusivi.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/14092296671.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/puzurekupojozanupevinu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/70186195641.pdfIn PDF document text
    • http://bakoca.hu/files/file/88422497706.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210627150936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+3+types+of+local+governmentPDF 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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 11180 bytes
SHA-256: 0351f0fc60af670ca069ca11e46b838e374c5f1de7a23506815168a93b3c167d
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 18176 bytes
SHA-256: f37f2b880a146f9c534d56545ed32b25b43fc49e76549b7c043448bcd8e0f4ab

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