Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baaef83a8b04962…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 01:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25ef390ba4616ace16631a203cd92b35 SHA-1: 0c40fd6cc23882ad3029bbd594cbd0cca52679fc SHA-256: 4baaef83a8b0496267083540ad0e0f64110e6c13652d875a9a7012c458fadf2a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics indicate an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc891b448e---vusinenopagiwiwewasigin.pdf In PDF document text
    • http://kme-kme.cz/files/file/66207022700.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4095bc30---fanibukiwavox.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5ac484f36ed4c36c06fa22e891e9729a/momiwulodituwikowapiwaxaj.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160944a6ecb438---lusipekozidisuxokeruv.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/balorixiferugida.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a702f3a9275---79260080403.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16120640a40441---xexub.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/wevumanufarusa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0f020c59---dixewifulumudazi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kubifebofidatozomob.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/299c24acc464cd67cb1e05471b86c85b/xelovulebepejabin.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b45cbda8f---wexul.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/c6l18dl9t3f35erdb2r324ancv/rozaboritisawenagaliji.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f519b078f9b---69855881182.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/wifupijubutolovizijuwij.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/55012370236.pdfIn PDF document text
    • http://landpas.pl/upload/file/sokutadiludovorivoleju.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/bimijetatij.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7eh7b14dr0bdtvalrfvs04j3dk/xubedefomanodetexuf.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/95351826620.pdfIn PDF document text
    • http://babamoleskine.com/files/file/53448021377.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b98512d12---31826543410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+soapmaker%27s+companion+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_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 18184 bytes
SHA-256: 7ee3f2bb5fd613b84a4b403f9cd3860b2efb4fa268f1a23d7788fec116114645
font_01_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 10832 bytes
SHA-256: 28ffa947793e834cc1916842697fe9119b1da8182e1dacf98fab8012e08f222f

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