Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc41f3ba4752249…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 10:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9982caac448f890fd94fd96d67f38564 SHA-1: c6f289b9ce4b78aef7369002a7f3974a603acd34 SHA-256: fcc41f3ba4752249eda04fb36e119dcd9316baedad1ad03c69050662d7dea89d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document designed to trick users into clicking an action trigger. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm used to distribute further malicious content. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to a malicious site.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 72 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92bc970cb5---goxulenopafejufawarife.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/notaratomotufomexeg.pdfIn PDF document text
    • http://royalgroup.at/tmp/24581462312.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beb34292807---93741209306.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cldrd931t47rjak5io45pqi79j/nilogumeda.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/a0j639e35v73hd5fphf3k64al9/54377840134.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d06f7bae9c629b693df160a61a23bbb1/78121218654.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/kunelobevulutizenigoxe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7b06c5b68d56dd877df4e9f0dd5f398d/84811675671.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/78481361741.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1405cf6171cb4dad1859545b7082bc25/popunuvi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/4519141929.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vlumv9m233cu0l5tlapfp8s1t4/sefezageladuju.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/luvowesaneperexepeme.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/40c5ac41be1de8eda0fe3c039489a315/56892682937.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf3c7b69b---suzoxodovemagoxefuk.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/12806929298.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/62395546471.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1r2mpi3gqimh7m87ju26otgh1o/3360801959.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/vedagupujo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mixuwuxokome.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/37646903628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=remington+portable+typewriter+manualPDF 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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 14192 bytes
SHA-256: 6e3a5d7e98e31f4e7f7de76fa1b8ee548bed3688f5a5121ed372128ce6c3b989
font_02_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 10912 bytes
SHA-256: ceacac455acb909fc6870a7414eb297f0c1a2a2623d610e5e409c0f2b4683e43

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