Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd333761fe8a6bff…

MALICIOUS

PDF

85.3 KB Created: 2021-07-22 15:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f5b8cb6bd858cae2dd9bc4260e66367 SHA-1: dcca4d926f6c83f9336931bf96857abc24b65cae SHA-256: dd333761fe8a6bffb1f53732dde31b200141a1e423271e72ff78f78245889884
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful external resources.

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 https://nbtele.com/en/cache/fck_files/file/medowazoxenux.pdf In PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vekapapenak.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60466162c1---54201454953.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/lusoz.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/53581715591.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0717f277d7---13553549623.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vodezagesitug.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rfvadhi5r34h955b59oajjf1t0/soposisume.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6ba5ea8a12f9ddfcc1e5ffcffb2e7851/67443538216.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a173ce3997---sujirurafifexibifufa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fenijupopobo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/18967560626.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/silezerowewos.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e156b276c535d16aad3cfa7e5c70f671/35645987180.pdfIn PDF document text
    • https://activepymes.com/pub/file/lelezosurakosijevigupi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/12d251b2537a91a79c948679e8b79ae3/javaguduvajikiraferatimo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/bawuwujudeman.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98f856bf4---fezikaxo.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/vimuwemubi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/7221317381.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc0a5ce1d---kebosuma.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160743a040a1a9---sukekutefo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/67804980428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lymphatic+system+isPDF 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_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16704 bytes
SHA-256: b302a345e01862fe1dd47ed3ea2bef2bd3fe1f1ab2cebc96349ec9ee7a2db746
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 10340 bytes
SHA-256: 5cf5987f89f0c10079be4d5831d165216254a47ea3c2ad645d5c9846f1ac1f9e

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