Malicious PDF — malware analysis report

Static analysis result for SHA-256 4970bb236fd93562…

MALICIOUS

PDF

163.2 KB Created: 2021-09-06 09:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9286bf6fb092d339dc9e31661c18c6c5 SHA-1: 563f0f9983be5f613337f0084e900e13523201eb SHA-256: 4970bb236fd9356241e7bdb48b02d036cb8ef9e618cdc94d313a0d36eccd4f13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm indicators suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://actorconseil.com/files/file/45182089294.pdf In PDF document text
    • http://suachuathietbi.com/upload/files/safegasunujix.pdfIn PDF document text
    • http://logicamail.it/draft/media/69286029897.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/taseweruxisavibujakabufuj.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210901_B8C41E59CB5785C8.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/e2u1lb54j1bfm58vil748sj7he/56308984971.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1541c0de6c68a0ea6d946fa29ce2f24/63764174739.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/44928109642.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608986b656285---88604176548.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609876554726d---ziwataxubafulixonopid.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vaxesadepizudalizejun.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c18a65eb3---wumojijatalilapabefexu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/biputusasukedaguwuzuduw.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/dovumadamawejivipiwema.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/85a7cd4a7012841419a7e2737720edec/4504626525.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4dd1b8911fdd79b732dcc91400172f99/lajipaxif.pdfIn PDF document text
    • http://trivio.it/userfiles/files/fifedurivozaj.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5549f27a5e9f9549df606f78850acb09/xomiz.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/seditor.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v9orjnbcle9v826flrf4t27e71/geguvuwudaguvi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67225547699.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/kiselitafokoverezu.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/kofemozemazotadajaba.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/85946192718.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160899491e62c6---19143339382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exercices+corrig%C3%A9s+b%C3%A9ton+pr%C3%A9contraint+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED71 28588 bytes
SHA-256: 04318c10df6517e40ecf071a6c0704e06e2f6d23ed6b8f53b1a173e12ccf9783
font_01_sfnt_off00023368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23368 11128 bytes
SHA-256: a48e7ba25763a05857f6ace53aa6c877e5dafdd02fee1b280a31d9ef8517c9f4
font_02_sfnt_off00024cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000264ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264EC 16336 bytes
SHA-256: f4b0d29d09bab1c75c64e7e34c86f1f3317ee366c8907837c7b5c431f5676533

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