Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52d9e2eb7583fd5…

MALICIOUS

PDF

258.2 KB Created: 2021-08-01 12:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac28fd40c66b27c6ab93b520e877dab5 SHA-1: ce0da53ecf87da3edcdb351d7575cb0c229a8c34 SHA-256: e52d9e2eb7583fd5aae70a687197ce2e7d18bddc328bbd4f97f2646dd0326cfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8432

Heuristics 5

  • 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.
  • 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://kartplast.com/resimler/files/19387545497.pdf In PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/nobefuzidezuz.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210726084749_ty0t8w.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/71556400295.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/50475865511.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/194d115ecf98601de8cb08b760ee2647/gajananonovikizokuju.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/66682570375.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/45087487050.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/mopobe.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/60830116360.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd5dede30b---50863620389.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hootvfntr83sfnieto41ocjhvb/98166270422.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bemige.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/73911081791d4ec6a571c4301a85d57b/vakesasovimawu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/cdghfctrb6so7v7gqrvj3n46bu/23831063459.pdfIn PDF document text
    • http://artside.org/data/temp/file/52044822383.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ac4175d8---84471502701.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6717ee68---gafudadotovofebofomipolu.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6lmlnaidbvu7f73g2tnbneurk6/fukunefimagiseruperuri.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba04cc0e84---kigugovuzuvuvi.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/60370145758.pdfIn PDF document text
    • http://healthywithhart.com/res/file/53141895575.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e99c2bac20a1c5da68ac540ecf4bf3bb/81713687110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=millard+erickson+christian+theology+3rd+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36E52 16632 bytes
SHA-256: ff68716322524b672498e7e1aa97fe0a5ec11b2b637ef013097ef36ee39f4243
font_01_sfnt_off000385cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x385CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00039ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39DDF 27280 bytes
SHA-256: 1c7aa9199c993621c4cdb9aefeeab15ff564656c77b57ed8c1b4c291ca351eb8
font_03_sfnt_off0003df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DF58 11268 bytes
SHA-256: 5ad45db54fe30816c9adc595fbcda8829e7f315e7be6bbe6ca8cf6345ad80855

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