Malicious PDF — malware analysis report

Static analysis result for SHA-256 849cf59411a44eac…

MALICIOUS

PDF

96.9 KB Created: 2021-07-21 14:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 06de06ceba8f84af68026338908b3cc3 SHA-1: cdf9b8cd02713ec702a46122277550bf6ddd8619 SHA-256: 849cf59411a44eacecdcb3d85b5225e500cab3de4642d37587b9b2737c68c7c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://royalgroup.at/tmp/65792322694.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/18b09c929b1788a2568b732ed528be52/16517024912.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/35476519789.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5dbe5cc40---napax.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9c3ac674a25e4684ff6e80e89d82dceb/27935396191.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7111c93cd02be6d626005cb04d0f4847/84558588986.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210617_AF9973218C5238BD.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798911513d9---zedenev.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cab657206502d215f40ef96a7d255133/zemekewafuvojifuteb.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18eb7f102---65443548099.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/290445381800.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608439bcd86a6---18542570853.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/gegolugalumiwufezilasak.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60e82694d5144.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/22159820560.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607712bfc60ff---15501008974.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/lepududa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d08e0196c10d49c7801d89c747353518/45973287211.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63c058128---95773086178.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/89065231338.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609274203225c---32862734601.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/bajixiw.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e9b22481---25244946680.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/neponulewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=biotransport+principles+and+applications+solutionsPDF 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_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10660 bytes
SHA-256: be8618325a6bb728d12d62c3f364a065f664d24b3462b385fdfabc02e1449010
font_01_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 17144 bytes
SHA-256: c49795fe0696c07b45e47416f079b2732cd4ba070152f8dc1688924710302f78
font_02_sfnt_off00015e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1