Malicious PDF — malware analysis report

Static analysis result for SHA-256 62646f692edfed34…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 20:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69411a18eda2c631d9372b8f73d713e3 SHA-1: c0379b59918a77eb05294ccb5a643044e07b460c SHA-256: 62646f692edfed34a83d0a8b2f87579d9cd84f2a78a86456faea1baf8272de10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, one of which is explicitly identified as a compromised WordPress upload. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware download sites, likely disguised as a free PDF editor. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medicalproduct.hu/images/files/35934015564.pdf In PDF document text
    • http://mmbc.cz/_data/user_files/file/40141839972.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/fofolivajedex.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5ac6khtg8phi0rr5jjn3n8tct7/darufimuzijakaroti.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ddd4d81e---40149513630.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160750437eb171---78033372144.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vr5o1p1n7uf8s3lspqfcooinic/7145103873.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/bewunibisavoligupujutez.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2addae88e---vizero.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/saxunipajadajot.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/54071039503.pdfIn PDF document text
    • http://crm333.com/documentos/file/luvuwofabebovivolet.pdfIn PDF document text
    • https://12tiga.com/contents//files/28121883887.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799371396a---firefafudotabumirivaw.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3c11f50a---60331173583.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/83117964155.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ec779e8201f0053a103037aad65ae18/baber.pdfIn PDF document text
    • https://sce.tw/uploads/files/60d8b20c92334.pdfIn PDF document text
    • http://mega.kz/media/upload/files/jabigatujukusunibazukafur.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096f00540299---88941580900.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/oiumd9j199cniv91045mi9o55n/xejeb.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/pumanajavigev.pdfIn PDF document text
    • https://wrd13.com/force/file/11885260849.pdfIn PDF document text
    • http://thaide.org/userfiles/file/futoreja.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eadcccdfb7---45012703548.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bcef91246e0c44f968349535241d350d/vukuwuguminokuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=baixar+editor+pdf+gratis+baixakiPDF 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_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 19420 bytes
SHA-256: 0286c18885525d316e3bd807b5b5b89a3829483b62d635721f5f2a4f8a629982
font_01_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 10908 bytes
SHA-256: eb47544beb6ab18e1f35af83758b430b9444e23e7a6ff3a4e24cf685b41617e1

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