Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1065b15e80bb30c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 12:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6064dafed44dc4b6d0cf8b36780e39cc SHA-1: 32a1e7b8fd96fb0fdc37738e33e9402fb336b3ed SHA-256: e1065b15e80bb30ca478653cf9e378a058c91f447f6b2b37633ba4354038b63d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://artsar.pl/userfiles/file/rujusomutijaxoforidane.pdf In PDF document text
    • https://zakarpattya-tour.com/upload/topavo.pdfIn PDF document text
    • https://tarsiman.ee/files/file/gebudajozilu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/75283318882.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/9653141424.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wefifawazufepojudunugefiz.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/regijulupapazuvulinejigiv.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/23012565111.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/16180633197.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/470d30d6de24bfde6b425d91cd0226ac/soxixotijobodol.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/lorimisoximavogebunavow.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/50674178189.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/kelakadoxolol.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387b470d36e---17287631439.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/21308466574.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/tojisav.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xenirisowugatul.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/dumuwuwuboxefigav.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nefeda.pdfIn PDF document text
    • http://jsdarvin.com/files/20608578548.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3ab821c2---9063742483.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/fatirivit.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/79156063631.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/zolavawuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wr3d+pc+mod+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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 16688 bytes
SHA-256: e9901050fe6a4c5902b49fbce7636b700a683e477524fec330729de9e2c880c9
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10436 bytes
SHA-256: 6a26150d986f7c6e756fc412bb0489809a53394bb46a262d154dca3d993b8722
font_02_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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