Malicious PDF — malware analysis report

Static analysis result for SHA-256 3923184bdd7f2bb2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 23:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dde271cd658c4c52bc137bc69dfa7f54 SHA-1: 030d5cec9fd6daf0f276ba219237e144e1526ab4 SHA-256: 3923184bdd7f2bb2d23d86c1e1d7e0873166ed8092c5a6e3a4dcf12e27573b1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or lead users to a phishing page. The presence of multiple link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c888d9bd218---laxoxawaguxonot.pdf In PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/90029090998.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/duvukunevijalekozifibome.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/n08uuqhiqm2hj9gmlgpe77knts/miwakakuxanaki.pdfIn PDF document text
    • http://ezibra.pl/upload//file/32100531846.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/zewug.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/hcang9mtntou6r9mbt2cbpr3s5/70571731805.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/68341408987.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2etgojuu0cujflh6to4ekdqovs/38429207403.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/2710182197.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gufekexigasewap.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/pikokavokeropaloxe.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/wizavazojagosixajuz.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/91560256314.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e618d9d0---nutig.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/52031969841.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b84650af19b---73042278016.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/mubopapolasow.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/sutaxulubujosedoworep.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/duvakinofumadu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca12868cfe---60914116392.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4110d7eda---22745982388.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/71256409789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=corresponding+angles+worksheet+answer+keyPDF 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_off0000bf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 10992 bytes
SHA-256: 9138fcb07c776be063f4c01e4b780058c126c0aa0fbf743aaf6271e740ad419c
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 17292 bytes
SHA-256: d74c39c498420f3c2ed2bf582008f2953f31015741cd62fbe535f0c583582748

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