Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65c278b6b561619…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 16:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d5e7c465d6fdc1e5982930e9e5100db SHA-1: 6d262399e80d73f16aa74ad9e5065191cc7cda42 SHA-256: c65c278b6b5616199c79376073c515b83d1188f988955186184a1c64ea2e66f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its nature as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://hugslock.com/app/webroot/img/files/kapinagizomusebas.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d331051e---telinelotakuduzemetudofo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e4fde741---wilitewovigajokanopiv.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeec778201---68706824290.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ucu7qpkj4jqndk5a7u2jrso8ci/saluge.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/37229288324.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210815012917.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/tumivebimami.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/93352256362.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6lh8d9lsc3gvht298im6nq15tu/6172519042.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107532abe271---pibakatujegakudobom.pdfIn PDF document text
    • http://generoussecurity.com/uploads/nevabuw.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/udfvm2tve0ro51s2030npjoqm8/99496678024.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/rijigosibekiki.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/xukegibirisoje.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/99086e03b2ea416b80915a186c990cd6/32810982062.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cdd135e7fc210b6e65da1704f2352032/xuzodidegibowutafelej.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50a7d723e---52146222114.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2d2d02996858486a7547513b6338a3e3/bivowifefapidolukum.pdfIn PDF document text
    • http://didopack.com/files/31865300094.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b8e8b27c---34302611389.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/88855986196.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/33243289519.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/xupigoxer.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/97128476669.pdfIn PDF document text
    • https://vpmemorial.net/images/file/vudaxomukososujufasepedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ps+kalsi+stereochemistry+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 16900 bytes
SHA-256: 99870ef7c6425116ebd3084fe998fd5991cab54b6ae0febd10d3525839c71da1
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10988 bytes
SHA-256: fdb2eb3dcf44f42363c15e315c3fb95b6f267631c32201c0c32f3d3df7dbc9b1

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