Malicious PDF — malware analysis report

Static analysis result for SHA-256 0636c3e41d3ae2ee…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 04:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8d518f76241e954b7223a25b167e22ed SHA-1: 25cbe86a8eebafe2b5cfc3fe856028af2b0efaed SHA-256: 0636c3e41d3ae2ee772a19111b70f5d24240b2c105845bc06e6662078650d113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758b3306f6a---49857103239.pdf In PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/42129906764.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161187fc22f814---2282381216.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/36738276155.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078987d66670---rorigeluwagurafononabo.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/safegafekepepima.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/monot.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kefezone.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/veduk.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6d8dc25926bb0aacfcbf12b66d85cc75/65474404874.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/70114424043.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/niwodixobuvugosopizube.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbdcec775c---92263840725.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/kojux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721177b7c07---fokewunufudebafusuzo.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/zewidanunibodemir.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/coe8t4f4n3irssvbap9bagpel5/16782002855.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89724591391.pdfIn PDF document text
    • http://springbook.no/files/dejofevezezulaxigifatuli.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6ee3686fe---foliganoxub.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/66114013157.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/efe45686d7e33e55874fa3b25699ec9d/7588509103.pdfIn PDF document text
    • http://immopolignano.lu/images/rasegaf.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/34555666944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=attracted+armature+type+relay+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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10492 bytes
SHA-256: 441590f91b0e99749744cc5aa5910cb25993aca0efcdf9f8def052558fa77435
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 17780 bytes
SHA-256: dafa633c0d37c25442969081f12a34d06f28549a975deecbf20323b3d41c6b95