Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3d00c68e3a5be3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 04:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66d297fdd8c46721e318a1836c909f44 SHA-1: 66ced9b904ec923382ae8ad30174ebff063134e4 SHA-256: 0e3d00c68e3a5be39760824078910ebc4abec6c7d210c7cdaf6edd2aa6de06a7
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host many links, suggesting a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3398bb64---50270871005.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6418e65d8e---55392730999.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/91868694050.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/tesagipogodefopaga.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/69137876005.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7df61de2---62600497237.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d827eb7e4c---46561255147.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/4331187256.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/472k7pduk8rsis380lpenchqp9/nakopaz.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/95880473826.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/50639645105.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5658b11d960ef854e613490ca797083d/48118189041.pdfIn PDF document text
    • http://www.infos-lentilles-de-contact.com/images-sites/files/kewawogutanuvodoji.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/sipidusekakamokonavubunix.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tikoturekajegikene.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/74232579970.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a677d699fe842a490e462bdf2b193c88/pizelinuvutofipivurewamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=symptoms+that+your+thyroid+is+offPDF 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_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 10772 bytes
SHA-256: 5b0100fa556137c1ac80522975a7b38a78932b3389c51d5a7e268a3f414fe120
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 16832 bytes
SHA-256: 93fc70bb160312b32de3ccd0d1bc72f59281b96c100bfef07a88e5a6e6daa2f6
font_02_sfnt_off000131d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1