Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb63a50988b796b…

MALICIOUS

PDF

93.6 KB Created: 2021-09-08 17:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 552385a01d746368371cb960dc77989a SHA-1: 4c3df68ce98c0d0a2ce87cc6eacd1ee591d50dc6 SHA-256: 0bb63a50988b796b7bf6b24ffe317699cd4fa9557be4e72809ae9bd127ef6767
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it functions as a lure to redirect users to potentially malicious content. The presence of embedded JS points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://chcial.ru/uplcv?utm_term=social+psychology+david+myers+pdf+download PDF link annotation
    • https://qwert5.com/psum/admin/userfiles/file/44297870468.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jifirizozu.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/fofevenizevusagojamiwi.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/6785230656.pdfIn PDF document text
    • https://actorconseil.com/files/file/vuxugamujevolinarisopu.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/28144741649.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/15781338214.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/14293872407.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/fumolula.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/vakisewopozo.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/sumekozojibiwozaxoxurik.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613831acdb24c---duvizoramolarorus.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/lotinalodufimomab.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/kuvatovikonijutagujib.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/53035605027.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/segijunujep.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/31690558314.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/80591400853.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/42855248168.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548953269f---todabuxijelekamov.pdfIn PDF document text
    • http://kleiberit.ru/files/file/16836078531.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/40730671004.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/meredasuropezikel.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/dibiborubedoduvuxa.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/grmm17k6m240qgul2gai11n2cg/lufimosalana.pdfIn PDF document text
    • https://coevent.ru/upload/files/woginiwumosimomimagog.pdfIn PDF document text
    • 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_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 19416 bytes
SHA-256: efacf46feec216a3ecc5b2d970183ee9eaff122f9dec0fe66ab9c13ead2acf7c
font_01_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 11308 bytes
SHA-256: 488d9fb212ebf02ba94133ec917fe2ea53b4560b28f66221b203e6a5f03026ce
font_02_sfnt_off000150be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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