Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc66f3c1f92a038…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 13:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 775bc1d2d4e85ac91282501dc02a06cb SHA-1: 3b00f1d84f4289bda4418d2cbe49868bc6cb5293 SHA-256: 9dc66f3c1f92a038bb0bb2b2e3ba12cb66492612ef54c28678406333d503d71f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=wear+os+find+my+watch PDF link annotation
    • http://saiprogetti.net/userfiles/files/dawepanida.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2d2f202bfbd108a1c3eb38b8d1a316d8/36431791258.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35db31fb73a55c8ed45fe368ac34eb64/31189458095.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/220d85910486c7327a6bf3a8817217ce/torobagavijetamosuv.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/girefasixom.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/jofarakobezekiguvuj.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d50e896ca---wuzegelibaxuzuwatob.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/45989559970.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/zatekoxibuzoposekamowo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c51e0343---65281149399.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/2942460107.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/96453630900.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06f5359a9---76850153308.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc0ede045---43413308273.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339a1ae93cc---7456960830.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/61028988833.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/wuredoredixib.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210903230919.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/55871069236.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5phcpd378va1s10kd4dlcu2na2/33687556603.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/55597956626.pdfIn PDF document text
    • https://majubesar.com/contents/files/40318161321.pdfIn PDF document text
    • 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_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 17892 bytes
SHA-256: f38c4fa5f627b31d2c5859c816599b4e4a340c9c5acd149f2002618e53e538cd
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10888 bytes
SHA-256: 580e8e421b218c668aaa9ff65d49e458846124782aef1da13e33dfc68009049c
font_02_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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