Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ccb9bc23251de…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 14:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ec23879a172129598ceb0245a579c5b SHA-1: ee70139a844916d32baab8d8972ee80448d07f53 SHA-256: 8f8ccb9bc23251de51949bf9aff89d011db8d3c3dae6daf6584daec706cdc631
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/32425256883.pdf In PDF document text
    • http://bangdientunhk.com/upload/files/peneje.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093060b5a9b8---tupexirefudakurateloju.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/xetivi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rpbrb1p33lkisbnr425pvm6f59/9188326078.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8cc9a852---papoxatawalazipu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05cd4f1f6---38130480941.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/togivetonagunex.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/46515290975.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b76855b47f4---81875271701.pdfIn PDF document text
    • http://ministerium.pt/files/nakalanizedenefepil.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/54127203843.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/xorepugolidesasa.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/baa6172068da7fabbd2537e1277030c3/82738748102.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/30317819666.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/61550887014.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/sevawelokanijubaxezibile.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/zavorobosoke.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/12868986991.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3eba3b83a41a0fcff35dd5c078a2c52b/58823748267.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/juranalejuxoxanepokesu.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/rubixosaturikibazumot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ms+robbie+mac+and+cheese+recipePDF 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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 19192 bytes
SHA-256: 7e7b232fa487983c3fb77fc637a9bfcf6ed4278134d5e5af896f5588cd3f7199
font_01_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 10768 bytes
SHA-256: 9bfd5261bf97bca33a8a2f37c3d21b1f0a33164638ca048839903a23617f18af
font_02_sfnt_off00013304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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