Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c09bb4e2f5d9427…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 11:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 076563d8b0187371bd93da61ef8cc5fb SHA-1: b182a4934b0eb7929b99e0baf39b4253ac0b8877 SHA-256: 4c09bb4e2f5d9427acc00e5cb267589108f7b322c52666660374a22db9a07ab5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. This suggests the PDF is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nbmounts.com/userfiles/file/1630500721.pdf In PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/31931090629.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472952bf69b---banezotikezawamopexar.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132077cce377---bukawuv.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161528972da19d---67487420759.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/39801691362.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153e076cd28f---12266493379.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/vibuvukefet.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b3f1d92d51c6174c615d8a91f0810a91/tizabikukuruni.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/nuxuxodalibozuxinubibiko.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613728dc011ff---dadojubenodiwokeze.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/sokukuzusoximuzoti.pdfIn PDF document text
    • http://wjcopy.com/upload/files/31431638810.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/foxipibuxanibebu.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614059967247f---bibelasototovofuravuj.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/85079741345.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/guvusavoluforo.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tewexujowokuxediwedoma.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fovugenufixumafuboji.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/melejesu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b886295eee4f44781a644b8d61dd6a48/gepajuvoxijisavivusuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exercises+past+simple+past+continuous+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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 10964 bytes
SHA-256: daec9fca927af1d775ca7a71ec1314bc9095f68181881dea37d7d2a378d0b139
font_01_sfnt_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 17180 bytes
SHA-256: 762cfbde5511051f98782ec6e1a6114171c8ed20217bd5a4b9a015cf82662a51
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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