Malicious PDF — malware analysis report

Static analysis result for SHA-256 92806258a9ef01b0…

MALICIOUS

PDF

97.6 KB Created: 2021-09-18 14:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52f660348256565563030ec6caea1241 SHA-1: 971b29ba8f94d75353f666a1c694a261cdd4e20e SHA-256: 92806258a9ef01b03ceb12c3150de919c9edbcda4175e2f117718fb1bb513017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://imhyuk.com/imhyukeditor/userfile/file/mesow.pdf In PDF document text
    • http://janaturismointegrato.com/uploads/file/18505865565.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166ee68dbc---13063325976.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/52949263160.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/14474195013.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/70548496837.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/39065419966.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f215bf764ec9a7a80d1e34e68f63493b/vuduvavituxumovalakoba.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613509748ee92---zivofo.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/wemujuwivazokekesubem.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/33592552147.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210905133342.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/wujojigularam.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/64703241592.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453e1b14ee7---magaxedelekiserux.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_200709.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fazepot.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/felelewilovebi.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/15145175210.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/pulipa.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/8231960792.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xetedu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/sevoponorenitebonowamo.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/15358150446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=market+wizards+by+jack+swagger+pdf+downloadPDF 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_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 11408 bytes
SHA-256: 38d422c1bbab92d0e9c392bcb90daa8a0bf1148b8c46a10ada75f03500c81776
font_01_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 19160 bytes
SHA-256: 4b257c7538aa7616b45f4e7be39c57d37272d30f5472db6d330b5aa69e7d183c
font_02_sfnt_off00015e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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