Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0fcccc94fa7d43…

MALICIOUS

PDF

91.0 KB Created: 2021-07-18 19:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 293e6912efbe76143630ef20400e4c58 SHA-1: 273dcbef648af198937d59e3ffb49d674549257e SHA-256: 8d0fcccc94fa7d43e9fe5c6deba0c27c6b9e6f9e575bcee5118580177084ac8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05fc30abaa---48403668477.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3f9f3b6b---takisuxig.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3d316284cc7a29f2172f31e04ac4e347/99114504995.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tuzupuzonomaraxuxubagos.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pedazesidoxave.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/joriziralemedokoku.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/61757235625.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/76625439912.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/dijajofeloxame.pdfIn PDF document text
    • http://policylic.com/uploads/files/jumefuxesabur.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a36a778f---popofuxezizame.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831fd617136---9696325133.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9795ce5a7403e76a028905d58fa11413/62644561091.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/guberekiposexifanikajaniw.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/52246886111.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9iuim64hiaccg4tiolelckslk6/zosinevupogobubofile.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/lorapefafiselituwamija.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210605060542.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jaxabigikegabujadazat.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/96488506379.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e81852ddb1baa50cbd68c07bdb7727e3/nolusaj.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/biwurukuredaboso.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/95210421050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=basset+hound+mixed+with+chihuahuaPDF 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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 17616 bytes
SHA-256: c7cfaf51fd0bcb9d1a5a483b4bd6777a0cd5cf96592c20aa54e5beec949e122c
font_01_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 10828 bytes
SHA-256: 3ce6d455f85d278a76088443332f5aefffe1b6c45a8a3aeb2339754c40a4388e

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