Malicious PDF — malware analysis report

Static analysis result for SHA-256 e496ea8b2f9b66a4…

MALICIOUS

PDF

91.0 KB Created: 2021-07-22 22:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d07a35a768ef65e0ffb359db56176860 SHA-1: 696ca53ec9196aa72d7491bff4118672bfd99566 SHA-256: e496ea8b2f9b66a47de35e6b4e260348dea41493a2711c521c512e09c132a75a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/827518e4f130b70f1f6e131208508e6f/bogobu.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb910aa399d---38427224416.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/fijetozekukivore.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/17149636562.pdfIn PDF document text
    • http://candientushinko.com/images/file/93200517008.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/3907704251.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/752h7id66n56mcotgi5sk52ci9/17551065325.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160edd3b56f412---zolufovojaxetuju.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/52262924376.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/54290227084.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/99100222865.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/82887073088.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/afced6493782d73c3dfbf4c5a540a9d9/vuniximagexexoruxigudak.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/89oceta0k7lue238t9pti9ddgn/vajalazutariwuvupiled.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609477f70fe9d---64736073733.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e493b2a0442---93187664269.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021741655187302.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/69606416095.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a749ade00e9---totofekeg.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xuvuxuzuzotapama.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/lenelatevoxurozusawegit.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/14060447214.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/73dd9de8e4f4e6cf4de96359d128e27d/69552010779.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d6ca699878c76a009552c5dba194cdd4/tezedavetanevikisi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/supiwagiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=itchy+scratchy+skinPDF link annotation
    • https://medlineplus.gov/itching.htmlIn PDF document text
    • 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_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16920 bytes
SHA-256: a85ef46519a773a803c1014f3eda260828dba46fd67aa417241aef3cb088f75c
font_01_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 10184 bytes
SHA-256: 1c0204a775a8303e686e48cf836c0824885ee8697ea3ddaf3bdc5e13296bc4a4
font_02_sfnt_off0001457e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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