Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd636ae64264864…

MALICIOUS

PDF

74.3 KB Created: 2021-07-15 18:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 50d86d619a62e1eb8b21a68d9c2a7d4e SHA-1: 4eba461db5f94cb5f15934efaeb799716d8f7e4a SHA-256: 3dd636ae64264864f745000de9b280f2a9ff32c6cc87c5e53989a3e5b3f0900c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, suggesting it's part of a phishing or redirection scheme. The embedded JavaScript is likely used to facilitate the redirection or download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a958e5638a589ef3404b8bf14ebecd28/barijewowilo.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0d2bae51998fdf5e93e964cd5109d9da/83596238987.pdfIn PDF document text
    • http://jonme.net/ckupload/files/ruzevaxililo.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/57466419177.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/fogajibifiwugalosumaf.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jm8533egocatg43nii4tcnui78/7542729380.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/64153534073.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7399a51d99---19670462656.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/8e62fb9f3ee8349c0c7a93f815759675/xaminetadese.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/44783786876.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a5d50c0396bda692f2b1af57c9ab9929/mepatuvimetawituwut.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/18429189934.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/17840141405.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/59224699528.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ae82d3fa---puwemijuvijatamejifibuxi.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0fcf24d6917c38767a406245dd2829eb/pusodi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j0upk868e47c2f45r4vhtddfm0/60757402158.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0e7e1cc81f5fc03d9c4f113eb7d12ccf/90250646912.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/41c8fbcf24c08d09b0783d4b410f7fac/wugovabitudagilurisutu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/edad44b719bad24f2a4e08b726beeda1/15140479981.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/47455081478.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddbb89346---bovibovixixow.pdfIn PDF document text
    • http://nfc.soo.jp/file/vogemometijolalefevi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vunavub.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2a6fb07a82a4a0582f7a65cf86583f4a/guzaxofedatog.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7b50c04063b5dc13456fc78c84c26286/lapopupevi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/72bb14951be429b9d85395633c867d3d/12376213570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=grade+12+geography+exam+papers+and+memos+2020+pdfPDF 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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 11260 bytes
SHA-256: 345f32671f2ff64a493d573a963737bb9941f3e01cf6bf0de2dcf3c96b94eab9
font_02_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 16352 bytes
SHA-256: a88892373bb128962a9b61f120762df7b76263d315aa99337f47719fb0b1939e

Open this report in the interactive analyzer, or submit your own file for analysis.