Malicious PDF — malware analysis report

Static analysis result for SHA-256 deadc0ed9da1c609…

MALICIOUS

PDF

84.4 KB Created: 2021-08-16 05:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 77ab8d619bce689afb65c53fe186d191 SHA-1: fd580905721ad23ca7206bf6324b54aa7d0e3b77 SHA-256: deadc0ed9da1c60976c59740a0dffbb831fa1527607c8f1133d94192bd7f68db
156 Risk Score

Malware Insights

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

The 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 compromised or disposable domains, suggesting an attempt to distribute malware or engage in phishing. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/caobsl2mag27g0k6pf509b3ucp/97230047724.pdf In PDF document text
    • http://on-video.com/movies/movie_data/file/xodefigapugola.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/30174755153.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/64352953174.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/jidakowasoxedun.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/fagobixobamatezerix.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/78aa2861ac374b55de1b8bc428cb922c/27801457382.pdfIn PDF document text
    • http://balone.net/_upload/file///54043721100.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/49573920372.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160903b2ab6e14---girawubijuva.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d69c2a68181---sejudewukabujifego.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wuvofonegije.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/24ta0kvqoflm3abbmpu56h3mhf/26519416027.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/33332709851.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sezajugeboropuwasax.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/xezipukakubujanenowus.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c064ad480e0---78182768583.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ffa2ddf8aa2983cbd0894f544b0f8107/86167008524.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928d27039ab---93967337751.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b0aeb382ba48a4b8e34027c4edd0428e/sagejadadebodomuduwos.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef55e7194---folizo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/nonidub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=que+es+un+decimal+infinito+periodico+mixto+ejemplosPDF 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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 18308 bytes
SHA-256: d3c2c71a6906caa8dceb252e6af6c0c3a6f143a1b636991598e2bbcbfcfa0d3c
font_01_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 11172 bytes
SHA-256: 672d67df144da896a67ee3c8f1a6ac8455e4345dbe669268d63a327c6a108c86
font_02_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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