Malicious PDF — malware analysis report

Static analysis result for SHA-256 facc524086d1eff9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 21:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 029c522a6c22c18ac221d3ba0b5b8fca SHA-1: 43736b0bd5f0475526ea9acb4d766ddd584b5442 SHA-256: facc524086d1eff98dd404ae1ed19b7e31e22bbf3a82de32c5aba60bebb44fbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to numerous disposable hosting domains, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://criminisiepartners.it/userfiles/files/matefolufasafum.pdf In PDF document text
    • http://electronicaindex.nl/images/uploads/sumojevaduxitowe.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/boviwulogaboxobi.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/jaduw.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161370e3dcf2e7---78500528083.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0c1dacf25b47815a23673448aad485d/9228031901.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fitafuxesegazo.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/23857477359.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/15615549107.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/varek.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/87474472201.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ruzowurobup.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912234815.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/retobo.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/6147835304.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/wetiremurod.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/sifoguvibaresegironu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502cfe2897b---76044275276.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/72803252675.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/lvkns635110bgpkktbaajkde72/zulakupo.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/vekaxugidu.pdfIn PDF document text
    • http://foxadv.net/file/firik.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/gegivonorosimewi.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/6300149340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=evolution+futuyma+3rd+edition+pdf+free+downloadPDF link annotation
    • 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_off0000b44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 17556 bytes
SHA-256: 0ae3e59c4339dc9faa70c88b91670ca11a4acaba3c187f201f7a5081537afe3f
font_01_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 11012 bytes
SHA-256: 3589caf692c41a2bb24023b3cddfa3c2e0fab55b88c54333624f52ae24d8df8f
font_02_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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