Malicious PDF — malware analysis report

Static analysis result for SHA-256 2338aaae1c7e8b0a…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 13:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29f96e95ce81455ab112417dba423ebf SHA-1: d2463c9992ef49a903acc3b6621a49d25fbbbc25 SHA-256: 2338aaae1c7e8b0a2d66bbaa0f49091d7bcf2cc989105e8163dc3955a66a0b5c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5726

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://ugrctrani.it/userfiles/files/lemipofeb.pdf In PDF document text
    • http://anbao.vn/uploads/userfiles/file/naginexugexixumow.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/vujojulunikugo.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/pojetamuxodetul.pdfIn PDF document text
    • http://hueide.com/upload/files/mulogetekubasetak.pdfIn PDF document text
    • http://agrion.org/upload/fichier/15561777723.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137dedde73c8---40365449270.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o2vdrligr9p4ub4bi25okompt1/rogevoz.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/xuvarize.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/pirizegevubeti.pdfIn PDF document text
    • http://servmed.net/userfiles/file/pojefosasuvudogipalogiwez.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/pezibevunaxonoseras.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210926_184628.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/22228078987.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/18506894125.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/lunekopabulojisupog.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/dukepijapokevuz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140530dc7b22---sodorikugometajaren.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/kefumatapomugimajegaraz.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/49257532348.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144277361f54---61874451037.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613634110fb86---90536730615.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a7460e8ffceca5a350dd22a2c0448add/siroresobaduk.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/5130464806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=forces+of+attraction+between+particlesPDF link annotation
    • 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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 10676 bytes
SHA-256: 93e45a66aaca6aac33a53b03b09e1f3340092d7230b8f472d7c55be973445a35
font_01_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 17168 bytes
SHA-256: ca412e56b06dc08c29c9243873d4e1fe4c48822b2fd63d15cf6427ca6b92c079
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1