Malicious PDF — malware analysis report

Static analysis result for SHA-256 148d71c57e3f242b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 20:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e8442bdc94bc074b29a803a6010e8d9 SHA-1: 221dbb11561342d20e7c431faf336481acfb4736 SHA-256: 148d71c57e3f242b9dbf213c10a67429a3c2b66ec98ea80b8eebcaade5e5711d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure to these external sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://coretry.ru/uplcv?utm_term=pdf+generator+angular+8 PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072759b0dde7---wudadukovisuwekowigolure.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/fitoxarel.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vororanuker.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/84286120808.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sajodom.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/sibupimujo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa505f4f13f---51949993884.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0904fe061d---femifo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/lafajiropako.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9f5e957297aa7e55f6e95212d9bf2c07/68241915666.pdfIn PDF document text
    • https://bak.vn/upload/files/38566229661.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b70b50287e52bd594c8fa3b588b8d9ee/varujaxebaregegapabaxe.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ca563f92---56741605592.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/49861468587.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/58030801216.pdfIn PDF document text
    • http://rjt1.org/upload/files/57973952215.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/77360332285.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fumeforewez.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/48455503449.pdfIn PDF document text
    • https://tmtteks.com/files/sodipenozabadipo.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/lofomamukirubotomije.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/68121801266.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/polimivakolibo.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/53221944043.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a059f81ab7d---78360630103.pdfIn PDF document text
    • 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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 18372 bytes
SHA-256: 169d2146b83c47052aab71abc27ad796f9d870e0847fc5c0a69ada3dbbaec8ee
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10576 bytes
SHA-256: 74ff08d4c75f46746126df9b4cd2ae015357dbf158c4ab70c2456d0170951fee
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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