Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f152c86301ea1ba…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 21:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2b6f5830cb8a8dda657ae535974af61 SHA-1: d7574ff40c4807a84b8def2703c3d40594a0574a SHA-256: 0f152c86301ea1ba393d6cc2fa9773b9858e827162bfcc750a418a06fc549070
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://agrobud.net/uploaded/file/41172190603.pdf In PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/5010739085.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/pesajakulobapevozite.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32da29def---tanupukinole.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/fipaniwufaxepewup.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3e8a0bc1e11928d55192d9028126401d/42963860455.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160851ba4e42d3---mowunemowaxerox.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/novoloxakikatapebedanove.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/0aba15fd114c401c5cd4889402c0c8fb/30239692358.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/zogiv.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/lugavosagibitosidimo.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/48448490486.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/376ade8d681679427c77fe05d19015a6/wijugijoki.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160883249cf256---12046403402.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a109d45d9d9---51192853592.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/kavigubureneparoxaje.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/jepiguzidarakiwixatita.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/wizolezuwawugaz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3b5d96ed---bezilaguvowifaripin.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/26217197103.pdfIn PDF document text
    • http://18554080.com/userfiles/file/16714363273.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/18340231990.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b564551ccb4---97885373271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=peugeot+208+allure+2017+manualPDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10844 bytes
SHA-256: 0ee488f45c04a132289f8bea9ec0c6a01c48e1d6f4b1c28affb59ed8fcabf679
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 18992 bytes
SHA-256: 873140a90a128077ba68fb3ce1b716d1dcefae375292a87dbf949df343d26a47