Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb00c84d299fa3e8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 08:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7c881cbde5fe84082cb3b6e1f9be272 SHA-1: 8fe215e9357ecceda27a802acbb6233e6749a22f SHA-256: bb00c84d299fa3e8692e7761ef5c9ec87a0d69a756624e041d111bf53ffb3c7d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ekonopuntos.com/campannas/file/24498083428.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9778f71df3ad4f5361ee247d7aa3c816/30481438532.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081338ce1a6d---kusowudukidizasaxadefulez.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/zopedegelaniwo.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/pilanafito.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3eaacc250---64578378305.pdfIn PDF document text
    • http://generaldistco.com/images/file/34186349292.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/23081144949.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/1636164256.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/82193596982.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/rofixonusotopowiwem.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853b5943189---27444322585.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/toloxoxefurivam.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abeed174fee---ratosaxezutuje.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/26400604088.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f901bb5a5---65392528377.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51254529066.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e9641f701271fa5504ff26c9e19307ab/gitugewavozivemi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///ramupufo.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/58312655445.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfb13cd45---nesapabugex.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2fe09b579---88329601451.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57713b416---raxavurojeweveziri.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/90699767862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bmw+active+suspension+system+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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 17260 bytes
SHA-256: 058b87cbde5f0dfa5bed9efccfedf5f96b11428078de0234ea8ea790efc3e97f
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 11052 bytes
SHA-256: 2113f028827c5983c0e4cb13e344b38582cb0638b7a0023a5c4ec9db144f8eeb