Malicious PDF — malware analysis report

Static analysis result for SHA-256 545c352c9e20b27e…

MALICIOUS

PDF

81.9 KB Created: 2021-08-25 02:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4aac11cdbb7c6869b0d11619a216121 SHA-1: 480d1c294720ab83c1fe80a2baf99056c97a4cd7 SHA-256: 545c352c9e20b27e1703eb43956451e846f6f79ebf5b9183d0cb12202be7433c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://abpaluso.com/upload/file/76792420248.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/68808585441.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/rivazer.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/92415697457.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mixixuwa.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8abba6f3c0---88923536356.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/bcgqmtna6ksbbbcukl2engi6p9/nakeduzilodumelirinor.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/fumotebalex.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1165060fb1---21211216524.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f872f4e636b33850ba697b481eb25601/11526920315.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/32823267303.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d18ae16c---91734021127.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e30d85487a18f1a439c22f7d7234bfb1/rilavajuvubuk.pdfIn PDF document text
    • http://newmob.it/userfiles/files/nomijoru.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1qdj8n62dqkcpkbmr1bblq6ncm/12917114201.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/58910328202.pdfIn PDF document text
    • http://guchenes.com/d/files/10268680890.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca59f8568de---82079573476.pdfIn PDF document text
    • http://fxlcd.com/upload/file/15900470340.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/womekuxexiratebifoniguj.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/wopapipenos.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xidokevopupaj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160975937a18ea---nexuzobazek.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/vetazupovovunubenowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=thanks+to+managerPDF 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 17404 bytes
SHA-256: 2f0f84e2deece57096ee5f9975c936a42815f7924f95f72f052c094b716c5437
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10472 bytes
SHA-256: 0080d555a8b5edd308358d7fff24cc75f4d5105f0d7bc3c5c1637dec42d6c1d9

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