Malicious PDF — malware analysis report

Static analysis result for SHA-256 99357ae1812f5147…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 01:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 203adc7793e7702e0efee7441e8b05a5 SHA-1: ea7227e14a447b71f849411ca81ad2d60be7f727 SHA-256: 99357ae1812f514726d618d57a5dcd2cf208f67807c019f90c77585b08d7ffbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests a campaign to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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 https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/26f0c91915428ebfa5a6334db34bd1aa/23466870402.pdf In PDF document text
    • http://studionegrelli.it/userfiles/files/wejabisirunojepujababaf.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/53253503936.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16226219834025.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/texenebejivexavexixujekef.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/suxuwazemekefuku.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/15942514839.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4ac2edaa3f73e66b46d52b6a07aae77b/39414919329.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/67915960771.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c6a1c9a39---tererulitutizutujosuvejod.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/23472920589.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073227824ecf---ponufumofaxiwugedif.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/95034839310.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/selelelasibukeriz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/344uclh8dcstisqiuhteq26g5s/89848107302.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/muzesojupigatefum.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba847909a5---zobisiwezekusitimebalegu.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/67994566678.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/72469209603.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/1964853034.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/63097909183.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0726df542---73010405330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vois+sur+ton+chemin+sheet+pdfPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 10744 bytes
SHA-256: a434432eb72d40a8169569725c1a107d59d4518e6f671ebd6d89360f205bafb4
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 19536 bytes
SHA-256: 2d938b86c7008534716a6b3185482601d0c064d9e07dc8c1a3574bb95d7b0f48

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