Malicious PDF — malware analysis report

Static analysis result for SHA-256 74eb275b71e063c5…

MALICIOUS

PDF

99.7 KB Created: 2021-09-19 04:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc599eb0aa567f62cbc7d7db888b05b1 SHA-1: df1bdb098feca30f638a3d5510f835768a24136a SHA-256: 74eb275b71e063c5930c3716a632c4c9d45b12889b1e887fc71ad9f791a27203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various domains, several of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://v-rshine.com/upload/images/files/4877472331.pdf In PDF document text
    • http://asztalosweb.hu/userfiles/file/25042841505.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/84997480377.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/37174548871.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419936a55e---jesudazazozuvoxubenopuloz.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jenukodebafum.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vudakozonuki.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/46018610241.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/35534849343.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/BcLeE5bdOkox.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/20638451326.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/99386062777.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/51977346380.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e982ebc417e0205c978f4a453786a58/68336076583.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/64385463618.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/10392643194.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gaxelujeleligititapaj.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613760851b5f3---21341124428.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/telarugotodor.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9429b0a40898bbf4cf260c7414cf96cc/ketufinawetamebunubuk.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/48724358176.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kivituxawix.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/93797832012.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/57546467001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=advantages+of+plastic+in+constructionPDF 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_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 18464 bytes
SHA-256: 7c2344cf7342ff708848a0ce2d5dd7d9e147449af89677428e185e0b421887c9
font_01_sfnt_off00014f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16762 10940 bytes
SHA-256: 68f7b180b4f15de79226e363d6d441f59bd208110e4133000378a6fbc3218380