Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f32f0a96b20b56…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 22:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bb3f178e36a1ce464990fbb5499c1f5 SHA-1: 8f4609080d60a59db4041fd972aaf8f8a4a81c3c SHA-256: 49f32f0a96b20b56b14925d2ea2d06d4220f93ac1edebe0beef6ce54bf303e6e
96 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicates malicious intent, and the structure suggests it's designed to lead users to malicious content or further exploitation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://coimbrasoftware.hu/images/uploads/files/jopopevawit.pdf In PDF document text
    • http://amctop.com/board_data/editor_img/file/202106290341.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/20163261466.pdfIn PDF document text
    • https://hiroyoung.com/data/files/botaxakexugolofuzuxime.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210901055353.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/vubefuralejagakozuk.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d58906bca---8856131907.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160df96b34a1f5---41984926095.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/96349084637.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e5d105721---65967239110.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a288d36b5ba---lekebuma.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ed500bb0---gofajebigusavirezusadabot.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1fb7ab025596521aa71a0b457ad0f2c4/liroxirawewik.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/majukigivowa.pdfIn PDF document text
    • http://poorclarescork.ie/images/busikekudizateb.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/61197963304.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/05/file/20210805_150629_193.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/lotul.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/57511543593.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jalinuzibonofiva.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/3958630718.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/titozefuxamegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=in+1896+the+french+scientist+henri+becquerel+discoveredPDF 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_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 18996 bytes
SHA-256: 87fe6bca2543b931a4fe569ddfa4aed7c96ceeb5a757d751657710ca01c61912
font_01_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 11408 bytes
SHA-256: 88bf8e14c5d71b811d4499bf92de7a1f7a79c7d0587ec8135b512f8a831bef74