Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b443ce9a045e7a…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ef68f58a8f55dd7ab41b16d46694837f SHA-1: 18579d59c15d9aca68cdc248960b44c6ae37b706 SHA-256: b8b443ce9a045e7ae4f83274a48da7bc01eea3fa053523d311843a4baf016514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The PDF structure and embedded links are consistent with a phishing lure, likely intended to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=new+ios+home+screen PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qn5vuansjielo7289fcotv7e7a/vadixaxi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/453173c8fd7813cab12be7bdb5d3b55a/nosedezakesorezoratibazu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/rowijukarikodojonepi.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/41562469336.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xafesefuvo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1pr42e7qe83b79n5l2b014t7jp/digimiman.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pexadedupakopu.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/30491662723.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/megukonedunabelusu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9abd610f9---lasigelevuduli.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e02d627ffdce1aec9c28feb895eefc84/sumozopujetiwa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160749ba5ce3c6---womumuruvureburunileziko.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/gogufuderepitimezeditim.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/48369468767.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/rorizazag.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d8728899---28241840980.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nojiw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c105317d984---82671207751.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/fq1od2f2rjlb1tdqh7pe3bke25/86883120916.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/42737512909.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91d83ea88---vufitoleruweso.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/borefujilatigumokafoxaka.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f506a0f46---tajit.pdfIn 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_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10252 bytes
SHA-256: 635b03b814efc8a2d4dac4133bc516017dee01deb629925fa208db63e049e9de
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 17620 bytes
SHA-256: 58b193eb126a341e9704ec3d03dd29d5c1819071e78854747b10eb18a00f9e9e

Open this report in the interactive analyzer, or submit your own file for analysis.