Malicious PDF — malware analysis report

Static analysis result for SHA-256 db47eb87a141c635…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 23:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 067e03536fe5c84b2eecd42ff510856a SHA-1: ec68f667a9e6d7578e036e5976d486123830a1b5 SHA-256: db47eb87a141c63574c8db44d8be31605b447c7f6c2cfe18d549bfa3b03eec6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The PDF likely uses JavaScript to initiate redirects to these external URLs, serving as a lure for phishing or further malware delivery. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hrudolf.com/userfiles/losebumowitozapu.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/povulorowusogilemot.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/67713679467.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/fotaxonigikaponubolalek.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/21106f5db37182655d3c09a94ac449fd/89055757918.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/narowivuruvisa.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16126b008899bc---kerusubelewidusipisorab.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/povikidinigatutaz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e11ba82e5---xivitateputubozifasu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uv72a6nms4nv5lcafs832m7p9u/49078550809.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6bf45759f46c81aa0ecf060573d2ec73/gezefafekubigawuzodedaper.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/rovopepajo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73fab3b77---woxafo.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/pefopesopefuredimes.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/sikik.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/13448847549.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5378ef72b---49449971204.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4405c95149---11216139820.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1611beaccdd613---putirojukaf.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77c29206b---66218915876.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/rodujanunenatali.pdfIn PDF document text
    • http://davcpundri.com/css/file/vubunukaxiv.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/41986439270.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/beniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=surt1000xli+pdf+espa%C3%B1olPDF 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 19204 bytes
SHA-256: e472ecb69cdc2c9fe9a09e44ce65cb07a67b10cac1c733bf8e6921c6ece457ac
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 11044 bytes
SHA-256: 8aff1dae3055b64d8a563df803a40793cc7cd1744e62f0b8f4b492ad4135eb5d

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