Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b4cb40fa111268…

MALICIOUS

PDF

79.1 KB Created: 2021-08-18 22:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e238104132ef9120754c7d7008f16a86 SHA-1: 3cf14e045abc0cf92dd4df2c8c7e3fa9042e60d4 SHA-256: 76b4cb40fa11126834e9d9a24f9f52410eb257b97896a20690cc2b63cbb2a35d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.hgbehringer.de/img/files/files/73335434332.pdf In PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/99543745310.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ae91c317d58e470ff7831a4ab1e83975/toworinimiwopovom.pdfIn PDF document text
    • https://pcetravel.com/files/file/89718108405.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/49933917477.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mivasafizaxu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070118d1d67a---zigemalutuxuwopem.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc17468711---wogeripomoxamub.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3a238ce6ed697cc27c3f03b51b48eecc/86162578823.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/fakisidekexaxigaf.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/45b94dea5ff05f772ca4a4d29fb5f540/23503986020.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a70261d5aff---kovonumuniwuvob.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vaduxovunomukoboku.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/87454728872.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046d04fbe8---7668915922.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/491f8a7db3f09f03fef44618062a7421/foxuwijidamedewasesij.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/kosapovosol.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/83003123924.pdfIn PDF document text
    • http://halmar.info/userfiles/file/73183556645.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d35b9a9---rutina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kpss+matematik+soru+bankas%C4%B1+%C3%A7%C3%B6z%C3%BCml%C3%BC+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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 17148 bytes
SHA-256: 7ed79cd02f6db2387ef0ff13670e20a0efd163e00dd710d31582ebba7cac4ff3
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11692 bytes
SHA-256: 2e721821ed16dedfb4b81923d03d7efce443318472cd7229286e49a151feec6b
font_02_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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