Malicious PDF — malware analysis report

Static analysis result for SHA-256 d216caa8dbbf7d9c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 20:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 516d25fadcc4ed1418fe5c0127edf3c1 SHA-1: 897575c726d1b86e2af6c63fb68a6c01a55981d1 SHA-256: d216caa8dbbf7d9c5a025e5ca7e1c6cce34c35ad3306e0083640d96cd517ad32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bdsductri.com/upload/files/19011871085.pdf In PDF document text
    • http://kitpaisal.com/mypicture/file/pezekaxidukisofixulit.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/notuwixizu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/latomuji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146e4f3a6a01---17821206025.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/123af5554ce2557589a637004a174982/69832401685.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/fikuxixo.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/63304175476.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/takapimuzu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xiruvi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/92718598651.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/40020441481.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/10084741128.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/nidudajufebepoli.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/xugonunewizuwigomusomawex.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/lifawasavuwawarevapu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8069d41c088ad78699aef04bdd335a7d/zefasuxorul.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/bejupug.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/godijunediz.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/dujonubixis.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/66145059092.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/60515223128.pdfIn PDF document text
    • https://phuquiland.com/upload/files/dodowemixanewafedine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=new+pipe+apk+2020PDF 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_off0000c0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F0 10004 bytes
SHA-256: 7e48f49924e2aacbed89841042024cc7b035526c731e90c874cf1b971ea923f9
font_01_sfnt_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 18080 bytes
SHA-256: 65def1824c1aabf01146aa7927371568c5355e003eb7dd4af15fa02bb6137ed7
font_02_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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