Malicious PDF — malware analysis report

Static analysis result for SHA-256 5514c583ad5100f2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 04:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 673a9ec9ee0f4fa980794a2ecc8cdaeb SHA-1: cffea12e88e0c359506b10b065dd039c98890707 SHA-256: 5514c583ad5100f2d2443c1954681b3cef153942c367855b77a14c09edba0879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to lead the user to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://driver-jazda.pl/upload/file/fatufenopetosem.pdf In PDF document text
    • https://mimpiindah2.com/contents//files/votuxameromebiwab.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/22955068598.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/zaxudig.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gugonogidapopi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f3dae2686658c40bf84d668fb9e697db/37596301235.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/33173363210.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/dulojaxiwonexemefabusasid.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dopilm9l2hvvnfk2i4alevp91j/24401999987.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/55489124469.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/64161940879.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/19780789331.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/83147989419.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/xofarage.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/sipukokufavo.pdfIn PDF document text
    • http://geodez.com/pliki/file/11443351759.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c5803325b42---8469442462.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/61787930550.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1nbjn33ctvg2qmh22db77cph31/bugumusepuvudev.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhe6i0n5pva59b90gp7d3gcc0c/92319451849.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8bk3p4ih4qtfs3cthpor922jt4/47122872375.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/noranetudufalupumakige.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd42f34b9---tukuzelarojaguletoga.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/tiwixafunoxisil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=diversity+management+thesis+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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 17480 bytes
SHA-256: 4d17932044048570f1d32c0d97de21749a85b24d82c535f60a95964edd121bda
font_02_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 10960 bytes
SHA-256: 9759d6c2c6888944b9c0b33d97822158e896c76303d6df0ee01e72ada522a402

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