Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff524d010973a6bb…

MALICIOUS

PDF

940.4 KB Created: 2021-07-14 08:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86296dd05fca5cf9c7534b96b4c02d4c SHA-1: 0182cd4acb6c5808263034cc5199e2b807d0110d SHA-256: ff524d010973a6bbf02663397160a4d33f7eaf90df9128c873026dedcafb4b04
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to compromised WordPress sites, indicating a phishing attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags this as a free-download phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest the document is designed to lead the user to download a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4740

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/50a069ca2ec569660db5c11c5fc23719/duligowufefiramugazedefez.pdf In PDF document text
    • http://wawabed.pl/uploads/userfiles/file/pobifivaf.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/zuniron.pdfIn PDF document text
    • https://hse.tw/upload/file/saxazenivujojuxalox.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608628bbc87a6---83566513051.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0p8mnm71q7q3mjgofau4173jh0/30882200241.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tf956f49rdkpt9iukrgu3ftldr/mixoliwanotexurovedivames.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/993fe15c0ec70166bb5adb2e85ae63d3/direkewa.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/21vqae9glcmu6n475on159i7kb/nigexejojofatesakesuke.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/89654585841.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55673cf948---pifivuzewotogeloxosoropo.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/tesorukofuwano.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bd9qfmnqlcsk65s5fe2p94n5ut/64341418483.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dle4q85201guarvsm4ibi2pbd5/53904182024.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc315c7bb0---sesiniv.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/90ca0447c57ef4bc3974b5f81c04e295/62244871907.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607615ad51fe8---xuxagominiwewirexiw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/da36c489665edb5843224982079ce86a/nonodigexinofujozobupex.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/21488188508.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/lotamunevaxijifanotufi.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/nerujogenagotujizide.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3db5a1a64---zogavowurururugodejatu.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/tekamilum.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zidiwovuxakigom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reading+passage+for+5+year+oldPDF 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_off000e3d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D51 10868 bytes
SHA-256: 2ae81e35776e94971efafb4a49ba168ea90dec18fb7b8a82f1a72472738215a2
font_01_sfnt_off000e565e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565E 18132 bytes
SHA-256: 0457f9430fb77f3da4a8d36f03789d04bcd736e85572389b83406e773e70371b
font_02_sfnt_off000e8585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1