Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c95dcb0292a55f2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 09:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 751d0c25c8fd75900d6586f36fffb5c7 SHA-1: 029a3ae43f22436fdf9c44051bd6d4f9b501c30a SHA-256: 9c95dcb0292a55f2e62e04be1f45651663fa6890ac6ca81609053ab93fe983f4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f1svve6ci3kgsfvdo1975pfmk6/47816117621.pdf In PDF document text
    • http://inspiredindianfoundation.org/uploads/91689842823.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631166916HgGh.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/robegepolisefanetekot.pdfIn PDF document text
    • http://sswjeans.com/files/89659752985.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/1875223259.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/736123d2c061534a2fd655844b66bb71/pagekola.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/wojeriwogufaxozivajewifa.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/towajodupe.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/8797793614.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/mawej.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/gifizoro.pdfIn PDF document text
    • https://priscar.com/documents/files/vuwipegiranaruweju.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/72964533617.pdfIn PDF document text
    • http://mamam.by/upload/File/file/39021508699.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kizeguzifefamufuj.pdfIn PDF document text
    • https://eventaipei.com/upload/files/53122075384.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/70877425297.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/07ac94fe96df82eebbc5a64fa32c3383/pokoneligogilumenibapodij.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zakovonotasuz.pdfIn PDF document text
    • https://ottopianos.nl/files/29920301265.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33cef363e---91724280925.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/97214486530.pdfIn PDF document text
    • http://agavietnam.com/img/files/keraraxugavabifil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+game+winning+eleven+ps1PDF 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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 19720 bytes
SHA-256: dea12fb5b1edcdefaf3de466f0d10a393e6603e2f4655acaea03821e8c7e170f
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 10740 bytes
SHA-256: e1c4c6c3c49e55d702488315b2876c3c762e75f73483aa5bb28ede5a1cd8a61e

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