Malicious PDF — malware analysis report

Static analysis result for SHA-256 89916e44c37beb09…

MALICIOUS

PDF

98.9 KB Created: 2021-09-01 19:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbc3c6b0fc130624280c1336378b3f90 SHA-1: 481d782c16359d6b5d6cdd9a85bc6a08bd18334a SHA-256: 89916e44c37beb09c484d73725e8cbace4a80ef6c963a694d7073be9e5742068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage, suggesting it's used to host or distribute further malicious content. The presence of multiple unknown URLs further supports its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0e5f3ad8---84856436324.pdf In PDF document text
    • http://topp.pl/_topp/file/46559478262.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608774a076907---21721837808.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/sidenufasimesogura.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/81393452297.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296d8738a26---fakofi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607319fb1ee30---losilijogikogimobe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/aa1f4488daad81f864285f4bf5d79b61/76024331832.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/1852653737.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/49184223038.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/100153519331.pdfIn PDF document text
    • http://contactconfiance.com/files/files/bunodunudinunigukepexew.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/jelosufitebuderelokag.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e550644e---54752287224.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/56324523182.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/52208298409.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/pisinebezewuv.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d0b4753b1071c78b4a8ab02f716568f8/sogeju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beadb46e25a---45910661479.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/40190353125.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d51483825---94601594373.pdfIn PDF document text
    • http://mfahk.com/upload/files/17947204727.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e24e2437c---lidubituxus.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/lituluwewasedinijitalel.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/raxukijesen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+bmtPDF 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_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 17700 bytes
SHA-256: d5475cb15259d57270d2536ed356fe900ce4d9e2571ffb5adf4e111600f9de02
font_01_sfnt_off00014e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E33 10232 bytes
SHA-256: d6b199f9ad0166e50b100de65b92a49019b4ce717dc028acfb619637769c31fb
font_02_sfnt_off00016515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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