Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd73270739e0c1f3…

MALICIOUS

PDF

77.1 KB Created: 2021-06-04 09:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 46ee0f4fca42fa41e0c9d7d9f0d7d652 SHA-1: 980b2a10a4cbfb6fe09f6d0cf261dbde2aef29ee SHA-256: dd73270739e0c1f3c4488c20e4d1562bbe5ca646c063ba01cdd7f6238ecbe417
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or engage in SEO poisoning. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • 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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160924d50c13f1---5780264834.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c87b8bd4f896fdeeb2e186c87e0d2e28/45722730045.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4539b8a68---wefuruxo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1606ee53873fdfc576bce1f3e1e92be4/megewisuzeke.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/74o397q0ujjpkc5dglaj687hk2/nevevosafutemodazufitusi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160867a27603f0---62387237721.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8a18eca20f981679230c74ecd62d745/54750636264.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/dsjrlq29tv289fapc97jb6vvtu/roxalerut.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/feferolilagavefetufu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e269ab7a2d---kuketabexega.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/48792010817.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/s7u2jnj9meiae8hciarlcaurk8/20108020696.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7063c5f6---bonepexupepalekoxuzokawu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3964876a350a604035d9c6dd080ae4e7/fadup.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d2693d151747bcc74a7650de070712bb/tifezevekazowo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8238a4c6---wilipenupukip.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ed7b9864---58399381702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+study+egyptian+languagePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5188 bytes
SHA-256: ea4e92ea363b1fbaf997b550b01aa3a9ea9a1a66a1383e48e3d451a184d83e1d
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 10848 bytes
SHA-256: 012337194fd3e03b9b8c3386af66e50d1c47bdd89b3f64e547411a8c86683164

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