Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fbdc1e7874eeb1…

MALICIOUS

PDF

65.2 KB Created: 2021-05-29 18:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d19e2e4653fbc66257313ea18ec13760 SHA-1: 08b67ae2bfa6b92c71be9249e8578b7f6a18c1ad SHA-256: 20fbdc1e7874eeb16f52bb535a3a73c7e6d541f1a440f934cc2512f553a77caf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content or malware. The embedded URLs suggest a pattern of SEO poisoning or disposable hosting to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pixomot.ru/uplcv?utm_term=kangertech+subox+mini+c+manual+espa%25C3%25A3%25C2%25B1olo PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4a5db407---lojiz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54815a1f7a---74505344399.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ed373f86b92a6ea57111d912e6ffc904/21479512098.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/96651789481.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc55b75694---kejamakogitememuludekezu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609641d7ec0a3---88829319398.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d1c48c43---21944431161.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/takab.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ecfddcd5d42d5a002b6c8f50e7fc26fa/57384287496.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcfcb06725---taletuvodopufemovavubub.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/514bokklnf55gdir1n1unhjjcd/30399281852.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/konozalesexopovuwitunog.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/84140d3487237a18df154f509396c8bc/napirekerovukogalufafe.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/83660522729.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/abc1445dd013b09fa8a47775c8100a5c/tupenevivedid.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae77d22b3---51358577071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 5908 bytes
SHA-256: 54cf81acbe92896c2dc97e8c1148e44f5397c7741fb4b2890ac4a9043b9ad353

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