Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f4ff50128f3d0e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 00:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67b890f987c1b6bcf4db84b563a49831 SHA-1: 8d92e1df15111537f24cf841ac5680997cb0e5b4 SHA-256: 09f4ff50128f3d0e7778eea4cf126ae3297fee0960f7b7ca71aa3507a4490acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the link farm structure implies an attempt to manipulate search results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bright-inter.com/file_media/file_image/file/66333202489.pdf In PDF document text
    • http://9275522-travel.com/userfiles/file/vejemavubujozidanipufoku.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/jamepekovukavavife.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/6231661356.pdfIn PDF document text
    • http://edituj.cz/res/file/68093854672.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/44274437833.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613340037f1ce---kifegukilavetowozimenenit.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/37993693772.pdfIn PDF document text
    • http://gdgom.com/upload/file/21090905182817868573h0uhvjxuvc.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/rajoritovogizubasugafe.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/71461483706.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/51061502631.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/73423746861.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392ebf3fd11---sarulimopewofa.pdfIn PDF document text
    • https://toocapen.com/files/41608325375.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/letuwoxajoxawonidajepoj.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/99697379919.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fanozedosadurunaronesaw.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/sawat.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135094b3d9c2---tilajovujabitotugoti.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/taxefixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mad+max+fury+road+script+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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10808 bytes
SHA-256: 49ee9130e89221737822206407b9e4d9d6c08f0c45c0e326cea1aa1c5404e0d9
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 18080 bytes
SHA-256: 3dc1a03350075db7600c526369d5c6a51016089575ae99c4c057cf87e263ea9d