Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4cf191037ab545…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 21:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76326fe06d92d699e52ec787e192b1d3 SHA-1: b6ea50384f9edf098e21700059bd05c4cbe4d288 SHA-256: 8f4cf191037ab54589ca6d27b4f0b1250f42960f47b32a2c661ec8f755dea06f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or SEO poisoning attack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6220

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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t8o2fpg6u6tu44a91vijdbi2ft/99483630752.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/dajulomegowuremeno.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/64020920991.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/14377928512.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/78963774945.pdfIn PDF document text
    • https://udruga-invalida.hr/files/ritirokafiz.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091605355070554.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/wosogafazubadipofomuda.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba61c4e0f---wesapozazebobimobolufes.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/xilolamilisapigelibexapu.pdfIn PDF document text
    • https://emmaushuis.org/pages/bigofugokawigenisa.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/69378412567.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/djmtmk2a747gr5ssqhlbbq44n6/6714110089.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/saxebe.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613101728a719---tiragaturefawunajumif.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109160815502139.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/zilobitemigomubejosulona.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/54384407067.pdfIn PDF document text
    • http://strandedtattoo.net/file/9094395300.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/javale.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/gorux.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/tukopaxemokiw.pdfIn PDF document text
    • http://land89.com/ckupload/files/79747868023.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/fewolu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/wugujegepebol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=game+harvest+moon+untuk+android+tanpa+emulatorPDF 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10952 bytes
SHA-256: 999aa7ee6e2d5715cc34a7c2cc03091bd23deb29c9d730ecf9cc6b7b74a2ca83
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 18196 bytes
SHA-256: da4d76e6195fe653336ad035051c9fabcf866bcc8c8d7eabd82fc7afbdb2ad90

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