Malicious PDF — malware analysis report

Static analysis result for SHA-256 64125192e41d794c…

MALICIOUS

PDF

73.8 KB Created: 2021-10-01 02:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d93c2561b8e03b074e27769e06739991 SHA-1: 807228ab782e9d9ac05f62eda420efdfb85a27b2 SHA-256: 64125192e41d794c50cc184a7a82b0732a58376bd8237a9f591a9209c74b5abd
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to potentially compromised CMS upload directories suggests a tactic to obscure the true destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/443fdadc8207642889cc0dcfa585f291/78813317596.pdf In PDF document text
    • https://jagamimpi.com/contents/files/56966742833.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/87097743692.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/85920226228.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416a2957170---81274748550.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/liwazali.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/29038503046.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139990668cf8---27668745604.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/zozufevabekexenasosobuve.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/refezilifa.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/89451986307.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/93615783104.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/44009557004.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/74436632766.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f7bc8b---13470765318.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/xoron.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/58047652336.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/33387970840.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f16f9fc81---bexowavaputileduwo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3519a9b88c859c7c85b9fbe6a022c34c/66889376054.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/modiloneteni.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/15c29597afe150d094c1a326075fbe6b/61788531793.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/24566318631.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/xiraxile.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jtosua8n0n1e81l9b5nvdm9f35/88868554065.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/vewudidafukesulobutesolor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=a+photo+manager+androidPDF 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_off0000b93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93C 10604 bytes
SHA-256: a3e09594f2798d6cc1c2160c32da50c2ec22c9030c23ca96c71bf24515ad4f43
font_01_sfnt_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 17904 bytes
SHA-256: 9f4aa932632097e8a73032b2e2050e54616c7de9e25a4b848ad73f81017597af