Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a3182a386b4a0…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87d827f7218dd89036a8302ba09f29d6 SHA-1: 86dd8369b2554b441456211e5647dde6fa552e3a SHA-256: fb8a3182a386b4a07e368e11d97adb1c1da77a7feaf96e340a2ed1cb15cdb281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of URLs like 'http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4cf47a08---lilozezinojegamuradani.pdf' and 'https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161460b5b1ce62---zizamat.pdf' suggests these are used to host or redirect to malicious content. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool often used to generate PDFs from web content, further supporting the idea that the PDF is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161460b5b1ce62---zizamat.pdf In PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/tezoxedorajodenutozo.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092115534069.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210910231300.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/71260381455.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/96257144451.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/maganunezinenezosego.pdfIn PDF document text
    • http://vuason.vn/upload/files/zefuzujovadejateforit.pdfIn PDF document text
    • https://majubesar.com/contents/files/26583498226.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/tobilebuxiworutaviledo.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kiwaxurosomasopu.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rebidinam.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/74592167224.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4cf47a08---lilozezinojegamuradani.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6b0b48e7c566ed20af6fdcc2a64faa0/kevufo.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/38498327926.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/xibofalunarof.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/bedup.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee857cca---dakogetiwa.pdfIn PDF document text
    • https://carlojans.com/cms/file/37771839176.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/0e9462800da8d255f92c6eac66112d5c.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/51835576560.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/46061117127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mini+pdf+reader+apkPDF 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_off0000ae3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3F 14940 bytes
SHA-256: 7ff37d3102bd4cc1324ed064fb93ffc7d44fc70742ed7f11c38593a0329f235a
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10144 bytes
SHA-256: 7da7dfadb34beb900b287856565234fb586962ec7a9310c4488facf267479613
font_02_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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