Malicious PDF — malware analysis report

Static analysis result for SHA-256 283128439bfefddf…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 16:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5d5743b47a6b6ff0c231ea12f5f5f96 SHA-1: 43a78510e3c3018cfed293f7cb272194dd46251b SHA-256: 283128439bfefddf3f92c6b866a72c3a62b89340effc98dfbf9b6b3ac47865bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. It contains numerous links to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body is unreadable, but the heuristics strongly point to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6b4240a38447150a55a89a9598e4a9da/14448208425.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd24f1d8d2---25848921273.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/86924937118.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/84cef3ed82f1d0b38b41d8977a133a40/70314178039.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c3da33127f0888564f23865a6ddbfec/katatexolanonorinotuwakej.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xawibirituka.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/78215983256.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43634a3f6---jorikunelaxudibofurimifu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f97cc43fcc5262673f6e370c69668c5e/zifabonimamufizefaba.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/sujuvojokobub.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4733a56d7f32d98c50b908b8127a9562/kiraroxadaso.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/pumivupeli.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/94cb94748568496032e7b0cad63595c3/xorejajalasuzesomaluk.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/31997796731.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/42f7164381aeaca01505e669ec009b60/movoloxakixazen.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/dc1aa9906951642afba245b6c965833c/73543100334.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/58901823b8b4394dc13626a6c7a6db57/78264470087.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/42823778047.pdfIn PDF document text
    • https://kawanmto.net/contents//files/50341535950.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/37705538733.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767d9a3f0ac---tebataz.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/24164163549.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/volisiker.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085258dbf908---gixezin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=roasting+tomatoes+for+saucePDF 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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10780 bytes
SHA-256: 5b3f59d7debbc309a50d755f736b0180134ff810a4c56ffbc396a67a4d5f63a7
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 17156 bytes
SHA-256: d0a18877946cce8400211eb3efc3b22fd973e86959946c7e5ee474d27386517a

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