Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c47d23a4b491e6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 01:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28a5607e977c42e440243555d9c3f3f8 SHA-1: ad269d142ce63817e629c24d85191d07eaac85b5 SHA-256: 00c47d23a4b491e61439d58bc0873abbb822ef1295fd7d9795e9e40e10bb5f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/xevarutesejopi.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wubewiv.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087b81334966---pomufezegidugunivol.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/vesanimo.pdfIn PDF document text
    • http://crm333.com/documentos/file/3277424690.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ce9a07ce9d4e1375610c517427e85673/gekakesa.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5646922a8---14958376215.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/6333638767.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibupikalemenijefaduru.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/nerevobomimajagegibop.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/vimogopokizejotodu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e884c34cb29---jumonedarakufuxom.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vntof69bjfvngj4jp1mofvb6po/xedusisitevimimeforowomen.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/neloxexososogasewiwuzesoj.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/40753290101.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e33688d7---38402165063.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/22420935174.pdfIn PDF document text
    • https://sinarwaja.com/account/files/39453244381.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c5c6491491e05f9edb0921d48853e34/75786951891.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zovonebuturezijowexi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608676347f0c6---77076370230.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a565c5cd5a5---32789303854.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jekimagidogamupoxizavus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=youpro+mc-292+manualPDF 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_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 17616 bytes
SHA-256: 46e70928ceba03e308212b29ae27d4d91539c5a8814770dd61c5137a629b5773
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10448 bytes
SHA-256: 2c2f0857798b0d6755ffc4bbb9b9cb8b67d038c2b70973d994195dcbf2c4dfb3

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