Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c899a90ed439ec…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 12:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c910500573c3426a9b6506e32fe3d0b SHA-1: ce7b1f7026c49d0aed0840cf575bf747e55b32a9 SHA-256: b9c899a90ed439eccc51f14ae5760bf00e76e78e4af6fbbb594d2291a2e2d447
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://rails-bg.com/fckeditorfiles/file/retanovirux.pdf In PDF document text
    • https://tylbm.com/Upload/ckeditor/files/24829575623.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/68658765842.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33952000284.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145017566651---rofujad.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/favadavudavijivavarufanun.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/50756294423.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bivojira.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfda52fe---xozomaderejiwuk.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56065180039.pdfIn PDF document text
    • http://halanmilk.com/upload/files/kerotelegivuwunomoxifu.pdfIn PDF document text
    • http://scsychem.com/upload/files/tejefepozituloput.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zobepozux.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/85897555437.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/6748128649.pdfIn PDF document text
    • https://bauarch.bg/files/xowumivewe.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/10637482735.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/22923742348.pdfIn PDF document text
    • http://sro52.ru/uploads/files/relanosigoteregenuludaw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ad0a1947---bivapijegusuwipu.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/30925572155.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/gigatumorubeponepazojetu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469230d5e5---dafuxinokijumivaw.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/budikawagawogawutavita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=online+pel%C3%ADculas+gratisPDF 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_off0000b761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 16956 bytes
SHA-256: b4476bb2c6f6741d819d4f392c6c4120fe875ab14bfdb8e3536ba86891d480a4
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 10616 bytes
SHA-256: 17e8d0f9b7847c55aaa99820cbd3509066826e6277fdcbf2dfa4e9a71a2da448

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