Malicious PDF — malware analysis report

Static analysis result for SHA-256 432df33ff78be862…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 23:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 49058b45f978011da6be0b08569ff3a9 SHA-1: c22a426b9ff70e6daf91ebd8216fe68cdd542205 SHA-256: 432df33ff78be862d218ff5b404b59cb931e27d8d395c32aaecd35072a0f3526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7569e14c4---xifonuwusodugetanumowu.pdf In PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/64532145098.pdfIn PDF document text
    • https://micsys.in/userfiles/file/tesopulikasadexotak.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/eff8414d162ea2837e29291d7c13dd30/xesorum.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2107914ed9d12e41ec62e481795fde9f/45352241279.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c13bbe1b---21185219630.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55d42b045---93410019222.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523005752594.pdfIn PDF document text
    • http://aimic.com/userfiles/file/defikizon.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430165222869375.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/88762026875.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03eb55db80---zawinuboranijarokudirofup.pdfIn PDF document text
    • http://adveotec.com/img/file/xasojedopukavap.pdfIn PDF document text
    • https://clinicscrm.com/img/files/buresedog.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021082118191973499.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/98848928123.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30af283364---pikenukovavuzupixugoma.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/72cd17794e32219a51a273fff94b1b3e/56517742700.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c3845f26202f239a7dd6b4594a089a19/81716712862.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/3983064577.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc324403b---15527772833.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xileripikaxuninedurunuxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=buffer+solution+project+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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10732 bytes
SHA-256: 37ad800f067edd3c6288ea3404017b390f35c3fb26780a188095e598dbaa3b11
font_02_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 17164 bytes
SHA-256: f566f7bd2b41454cdcf2085855e5aec4e42b6250aef8df98d6f63865f33cc86f

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