Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5bc50c958ab7e5…

MALICIOUS

PDF

59.5 KB Created: 2021-09-14 14:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46aca9cf6cb12d7e027dcb0592241cb1 SHA-1: bd1dac645a3467ef7d794bbaacb2fb469eb2068c SHA-256: de5bc50c958ab7e5de2f663af35387eebf6bced532bd3ee520da1c44577c40eb
162 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 or redirecting users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further indicates a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier also strongly suggest maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7488

Heuristics 6

  • 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
  • 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://idolyokocho.com/js/ckfinder/userfiles/files/49206038207.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/57099077143.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/68370218897.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/21063011588.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/8122717597.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/40290574344.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/37468489063.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b404954c9---tuzewusu.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/nofolilekojatagetosapaku.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161344559ed5ab---50807704185.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/88071796326.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/lagekijomivugilopifofip.pdfIn PDF document text
    • http://panteres.com/files/files/gisulawaxezonetoveruxaj.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/35308130405.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/280namta4cc9clqbasgk66n05j/91448177870.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/19258681408.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tugagavem.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/xodoruwefi.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/25394262777.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jopigulofemi.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/76202177496.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/94881098030.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/defilewurifexadigatores.pdfIn PDF document text
    • http://15881588.com/ckupload/files/zibex.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/21966430500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=boku+no+academia+season+5PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 18212 bytes
SHA-256: e0f29b3776e04ad348b53e90d9c43ec19dfad639883471188dc2b285048fea38

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