Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b754ac0a7a79eea…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 15:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e8747eb8c825320410b494a3a74f394 SHA-1: 9c59ce6d3f0322f28af18bce58875d72e07c1f71 SHA-256: 1b754ac0a7a79eea03105461e8b4f756b4886d906c88a8ec67afae68e5736f32
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=resident+evil+hd+remaster+pc+mods PDF link annotation
    • http://asv-solnice.cz/_files/file/23732826325.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/13070365643.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/42f466029dce7c8c84dd006e6f469675/disefamotaxoxuzumisawatir.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/93sea9use8gbsvoe3lct6inlk0/fitikebubidularezumuvesav.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078acd000159---87188330886.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f52995f8---dawakifatodasowa.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/g8oc05iq2brah6mpabkfgd48u2/piwavurogexegokuzar.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/jalut.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a6d3b5ff---busorureretodunavula.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/39753302934.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/q8ene9qcl7noek6c3p4sm0obv4/felazej.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokaz.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/refafurikafuzunare.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/14627389197.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/mufaduxaseje.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qectdaif1rv9d6etfl4enq1jr1/52823313450.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083c15add998---3920365253.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/5au36hlavusstrc360rplbb8tp/bibefegigavukupexotun.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/gukuzoniwapuxasogolojoxa.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9k7lreohflngmhljvcm3rcrne0/67232345656.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077795c73840---jazap.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/79817779451.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/jekeburutu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b69baa3f47d0e6524f75c95d40ee6695/beropoxobosozek.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/gumofu.pdfIn PDF document text
    • 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_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 16628 bytes
SHA-256: 59bb4dbea9d868aa3b962bb7c1383a3849fa875ed047f27a7b6c7ec2c9a60366
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 10892 bytes
SHA-256: c728826ad82d3720b0cfbd7ac399601c64361823202f0bd65bbd8d0ba2a740dd
font_02_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1