Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb295f1ab91165aa…

MALICIOUS

PDF

85.0 KB Created: 2021-08-23 16:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ea2c7f2bf01b7ad605eaecde8d752c2 SHA-1: 5197a322872ccd8f9d6211489c36b9f7c9416010 SHA-256: bb295f1ab91165aa92ad02342e8a97cf30199b02a34c63e3340d19a5b1984776
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f71bc390e---tanaperar.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae5b6d73e---16697525331.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/cd51cb63c8e2af6bd6132cc1b5c2dc55/51558263900.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7375565640.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5945e52f92---99469582024.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mevatabasavoxekiwupa.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/47083110203.pdfIn PDF document text
    • http://aurora-c.jp/files/files/xolibinariporebimes.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/fopapunaxovevazifirofef.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/pifexusuf.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/kewabodibaxikaxopamojusu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/nipiji.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/30283924272.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3de3c5d08da1ef16ab69142d882d108e/37041051322.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/59528284862.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/55660662448.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5538302d---1997461930.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/40915428205.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/81e53d03bd0678462f44454a3eac7687/kiluxunariguw.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/88805212917.pdfIn PDF document text
    • http://bienbao.org/uploads/files/72834192963.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e3723126c---lefiwelovuzewe.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/getine.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c9e8f0173436f9abe1c9c8d9e19b270/kiduwifulapevavuleguta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=365+office+activatorPDF 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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 17516 bytes
SHA-256: 2d0d744a792c8650dd6ad3d86dda6f0d1bb30041524b5cae6189b618e67917cd
font_01_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 10456 bytes
SHA-256: 5479feb414e5bd5758088613f2bdf92a7159d29fc0fd5c8389e811481e4a0187
font_02_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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