Malicious PDF — malware analysis report

Static analysis result for SHA-256 915030c35eb5e017…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 13:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 18aa99442b95c59e124eb53924765d63 SHA-1: 75d00f07b3ed9655bdf1ba0977c6d18f785b4f41 SHA-256: 915030c35eb5e0174622faddbac48ca558e5a48607f16660f054bfcd3897a0c3
164 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. It also features a link farm pointing to compromised WordPress upload storage and other domains, suggesting a redirection mechanism to phishing or malware download sites. ClamAV and ML classifiers strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf4ec5acc---nabakamav.pdf In PDF document text
    • http://inventory-acepipe.com/images/uploads/files/52551046117.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/51551758021.pdfIn PDF document text
    • http://freestyler.cz/img/file/nivolirore.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c9b1bc0603b47ebfb48984142cdaa4e2/44867863515.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/dedefifinedudiduvu.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210918015154.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/rekanifopokebemeduva.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/58007473506.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/magepojer.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/pixadukoxiduratogixepuzin.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pobepuvibuzafotuvojolu.pdfIn PDF document text
    • https://rinducm1.com/contents/files/wevukilidapabup.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qeskgq9742lmukmhvlgsakh0mc/gaxadeju.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/lojavolilizogozegaruwito.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/kekatipo.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/pivupopipesixa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1f13qm1e6k6ge06lvr9g7tffj1/2469575835.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/resevuzulapiduxel.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/tazanofutefetubigamezopow.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/bimor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+magazines+read+onlinePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/fusavesovofowe.pdfIn PDF document text
    • 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_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 10660 bytes
SHA-256: 53314c433b2e1f7dbfaebf4440d29be49675dca515287df3e2ba37b51abc8edf
font_01_sfnt_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16408 bytes
SHA-256: 62f5e9db6b13fadde5b9066a6636eb92bd4cf6c0ea5623ac10ac1ba5ec90c5c5
font_02_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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