Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce3b241454594d8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 00:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fdebb0fe8b7500a85f87bb8b3f3504e SHA-1: ab4439c4c7e1f6294ceb7c445023df86b5c5d11d SHA-256: 6ce3b241454594d863f2e1b48549af4bf0fbe51ad157843a37c8fd81b34333f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/h8k712vqhh6gmcndj5jjm21o70/jomozax.pdf In PDF document text
    • http://dtcguild.org/clients/80367/File/gidikakegejupupo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba6d776d4---99495433474.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ka134udelnb1556929lh9ecim/misexavotigiko.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/mabujunozel.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/gavutituvaveniten.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/72650186544.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bc8a81cj76qrkbe0knubaaoh14/raxumetexuz.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/gafizinisoluma.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/91273035105.pdfIn PDF document text
    • http://ruresept.ru/files/file/duvejanibopolopenepazig.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b2b0b568---18754272512.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/lofanoneribomij.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/ledodigirosefilu.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210704021157.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/53613909459.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d1c588b80a0b7e890febecb6ebf2cdb3/vekatepelulodebubipilora.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bosotutorotejipidu.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/95192832164.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/pefakipetiwaja.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wosuxamobipurufudefaz.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/tegogeve.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bgu0a235tab54p7noaqnnqagj7/vexogo.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/93071642156.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075df3f7cffe---25179074510.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/fuzop.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/vuweto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cache+memory+pdf+downloadPDF 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_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10756 bytes
SHA-256: 8bc4d2de60e8490e5316d76eca50c6d0a225000258e10cb6e87d297f0f0cf0dc
font_02_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16808 bytes
SHA-256: bd5e537545ddd259b5a0179bad464afbd354f5e4b38270e8511927ac1e71a294

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