Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efd58078ed5820e…

MALICIOUS

PDF

83.9 KB Created: 2021-07-15 09:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3aa732cd779480d28d6cce8ccbd2ec0f SHA-1: 70108f7253921c0cbcadec599e5fb890ca3e0fa5 SHA-256: 4efd58078ed5820e5563a08d529bbb96942443e83fdbbd87237afd2cd8a8d2fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=questions+i+need+answers+to PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54e103ef4---kizodidajimopomupapexi.pdfIn PDF document text
    • http://sam-global.ch/files/file/75767625427.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nekotevijexokaminudop.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd38015909---58026684230.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b37cbdcf3a5b6fbf32ae3b950aebe49/sadoxafezupower.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/3503712673.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/99788476931.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fanuvoxoxopesu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6e1e25fe---40613903400.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/968bfcc1b288d05bd12a2cc06152eb41/41969275221.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a882c72b777302e6b92a2756a38ed44e/mibepajewabi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79bc79323---53621325670.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/91194215006.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/14e4b8edcf31079ae73a2361f3f8e2d0/85722197550.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lql871r2fl6v5v3at6qoh6fqj0/gopiliditanuda.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/wilixiwozeg.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ffbc0f7f4---nininen.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/puxepaxazigepidarobefaweg.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0ebf5d7802c0055f9e21bd2946fbda59/37446669659.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2e5f1001707f560c2f0435d2a83d0a1b/tizerutijivosotobixap.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6aogesqdap20f63bldrrag7964/wiwabigejaka.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62fe54845---xexoke.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/cfce4c41186a43bd89b135b0e2d741a8/ramutuxevak.pdfIn PDF document text
    • http://fotossc.pl/_files/file/topisowujubotukijefefutas.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/86483202911.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f74a1a59d---vegutusewixateroni.pdfIn PDF document text
    • http://sooclose.eu/upload/File/11695665701.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d8f57850b813e58c304cc4dae01d5eb9/refudosiji.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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 17220 bytes
SHA-256: dfaaa795e8188254508f521e44a8001f72dc37c30100c09cc0f16b7779f66e74
font_02_sfnt_off00012a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 10440 bytes
SHA-256: 5d29172a76756fac8075dd5e9cd8275f720c8dd4f1ddf4b1b93b5bba4d30b88b

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