Malicious PDF — malware analysis report

Static analysis result for SHA-256 4787182099b1b9ab…

MALICIOUS

PDF

99.0 KB Created: 2021-07-24 18:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5360c9a155de8f9bf0d213b54bc89cb6 SHA-1: a4af58a4454f075687b44019c5ab9b72e4516829 SHA-256: 4787182099b1b9abcf9eea3d650c31fe75b783bd15d55923631483206d671c16
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and numerous external links strongly suggest it is part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://navigator-nsk.ru/userfiles/file/vosafopisidifakaw.pdf In PDF document text
    • http://df-foundry.net/d/files/dewutaruxevoli.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/44654905391.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfff7cf791---61347163415.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lenolefake.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c68500efc---397145992.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/xirowefogupipo.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b68be59969d48aa74ad97fb67deab371/36530750912.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4914616935---87831141120.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb146de932---32089607434.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vugokosokorokiwomapipen.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/83965915814.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/33860871955.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/nasepekopamegomuwan.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160881c9b63db0---kesavufizebafomivudo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806e2f3d3f5---vuwomoduk.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/mamojun.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/pevefilub.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/nogalomubajipel.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/59008102980.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f1809ef7---mawumo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff24211f2---vusowuzizoxoxigulot.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7a569f8c---9189391045.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5631527c06---67015929727.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2f600b32fdf921cca4772156aa27f348/lodokabesujiwe.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wutuluvadipogujelowaxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=route+of+acceptance+movie+watch+online+freePDF 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_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 20448 bytes
SHA-256: d898de63c4220484f3f8f23c0cbebd7e0616e52e10b71fc9ce25a24970f2999d
font_01_sfnt_off00014bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E6 10872 bytes
SHA-256: 69d275c30b6ab6a167895da3ee145455b652ec24dbe88e3bba0f37eed0a85747