Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4a83c5541e5bc4…

MALICIOUS

PDF

89.4 KB Created: 2021-08-23 23:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e4aec98a275d7bcc6f01a19c05429f1 SHA-1: 5d0cbfcd16a16c03cc6626eb491583eb8cc5316d SHA-256: 9f4a83c5541e5bc40e8bfc4e91242ebe75626704a56d8d70fd5b86babf6b8e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were extracted, the PDF structure and numerous external links strongly indicate it's designed to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://legalinet.eu/userfiles/files/5592545189.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1575d6036---9819272119.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/xabolibalagoxotino.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/9200913569.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bcd6f026---5509895735.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160769d8226424---60894713571.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f85dd077---12795671668.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/42531158691.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/zeluba.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/ruvopabotoxuxop.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/tulox.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/5456595059.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ce83a7544b837fe7a16de4a51a23e375/88215646876.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b912fd06cc8---92549049602.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/jobivusuzibafotuzepoz.pdfIn PDF document text
    • https://produsedecopii.ro/app/webroot/files/userfiles/files/27512704491.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jt46659f2o1g6va56q9k47s5s5/nuwen.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb7d0f36---xafugubinibabal.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/dipupar.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a1a02c430b2472bfd2037e7ac890f6a9/topolu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/35857911143.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a9a13fc228f96c8bfbe86ccfc35d682f/tarelufewezunavipemed.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/murixezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+way+to+watch+fatePDF 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_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 18100 bytes
SHA-256: d61431b60bd6da4da008fe623294284e0542dae9f6c52ab6ab21e7c75790cdbe
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 10344 bytes
SHA-256: ed9a99a9666e44d3e90e658e588eb58202405650cb53fd04149b3a85a2bc886b

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