Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad3bfb83ed92ef2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 03:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de5844d4c9912b8d00e637c8ca10f328 SHA-1: 8a71e21a3d48147a2727a77a3beebcdb66b8728a SHA-256: 4ad3bfb83ed92ef2829e2fe2b69e9147a71ae6d35ada71d851ca99a937f25e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cbec89bfe6cda5f49a32715c6ff1b134/40256357860.pdf In PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/24158616150.pdfIn PDF document text
    • http://24cvety.ru/upload/files/74828965662.pdfIn PDF document text
    • http://runhouchem.com/upload/files/xetolelepibikibat.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1f805544---40208471878.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9adbd9e94---5387343304.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/56031426192.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/37ca1605fa65752fb2414c853c792a5d/bivawanasij.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae35e29ed---zanelo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b90dc18c49e---gipulexezos.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5be78bb7b---neraxilafu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/zufuzojevulenikelisewafew.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/604f8f5ad48c16407d3e74b6dea93437/bagagifudarak.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/27360072036.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/65306570481.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/29735480452.pdfIn PDF document text
    • https://rajaunited.com/contents//files/92615263353.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/13017455775.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/bifodelasoxutejo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9141d87a6---fitibeb.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tugutujawajogitig.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16083fab51ce08---29988891387.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/41073468549.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/dawejijekurukorudedavi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/85533423286.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/jalilen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wingdings+chart+pdfPDF 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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 10592 bytes
SHA-256: a0cccafa38c610959ccef4de99a8b56d5d00b1d8fc504e06542dd8533d30b263
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 18256 bytes
SHA-256: bc33302c25c593584327710a9841f5a5a6f574b166547d0b7c301684d5801109

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