Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d41fbdfd98924d9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 03:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a32cc39bb55796d1ae5f29f9a560f18 SHA-1: 6625d6e9f9b98fb828dfb9a1f4f560fcfdfa7eed SHA-256: 8d41fbdfd98924d919094bfe9973adbc33da5938ecf8ecf3dff564b6e0fa1408
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

Heuristics 5

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=a+quiet+place+1+hbo+max PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614672d68bd78---bomalezomibili.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/8423983290.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613033223ed81---68366988266.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7fd1cd5461dff0687324ca4494b49f2d/88197173444.pdfIn PDF document text
    • http://goldmustang.com/files/files/leveleresawoj.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zawisazozunozila.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/gital.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/30909876815.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/dunevida.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/15306751257.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/mosujokugagugerijinapu.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/limosav.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614682922b86a---33567577093.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/mafomasoxosepera.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/xujitiwobazujopeliju.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b61a8181---30498737524.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/maparupazizapenawukewag.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/41677391433.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/32285586059.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/80092539489.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/rufuwokemunakepef.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/49217753427.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb42ecee---zukekiweruvugizojasudol.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/63986311416.pdfIn PDF document text
    • 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_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 19344 bytes
SHA-256: 7e28143d7cc57c618e6ed1077634ec8f7a1ccc1c9daf72d04773f866668d1baa

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