Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a06d3cffe97e67e…

MALICIOUS

PDF

81.6 KB Created: 2021-10-24 20:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 759c9dff79537427e674f53cfb5e309e SHA-1: 75c6a9ecd58ad3d772991a7ce65acf69adad0076 SHA-256: 4a06d3cffe97e67e154f9a97025bf0a7766590f4f5ea9a3a8fc0aedca1cb741f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable or compromised hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/nujasage.pdf In PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/veratupa.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/jufadarusukoboz.pdfIn PDF document text
    • https://phukienbep.net/media/files/dejiravafinulilopisel.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/27424761.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/10966735973.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/tasusuxijo.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/38505519023.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109042359382528.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/30125273784.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/98787563350.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210914_C3B05C194AE3C5E0.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/81636321159.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/vazejidog.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/posokugafukuwode.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156355811269---10134045330.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/35182736730.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/wowufudud.pdfIn PDF document text
    • https://superpart.com/files/20536038410.pdfIn PDF document text
    • https://ntm.mcapps3.cz/multimedia/file/dilufovasejonu.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20211005235303.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/jupatozon.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e46251503d3e5cad03beb895f8b4d9d/zemodasigaxisedusubowi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478926190b2---16473571842.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/69874885411.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/8141134852.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=middle+eastern+chicken+kabobsPDF 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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 17972 bytes
SHA-256: 1dcc3914bda7e2a3b2507ab1eb507d359c6aae1123eb4c3bf66d8f6c697e374b
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10692 bytes
SHA-256: f3ea218c0ea966dd7415bff05cce8f3ab8b1468e5291425c8e0525438973bb0d