Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb675ce3cbce20de…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 01:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06bce1fcf798ed525dfb8c611588ee75 SHA-1: ad80871928e0514141fe022dc354d1a04abe0bed SHA-256: fb675ce3cbce20de42df4ac10e432bd3e5eab0accd09c76c9afba9fe5a58bec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. No scripts were extracted, but the presence of multiple external URIs points to an attempt to lead the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://baaningdoi.com/file_media/file_image/file/lazizuparujuranedetos.pdf In PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nigogebelitinubez.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/dekotapewofewiwigakifuful.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/78378997662.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/36019545439.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bed4140f0c51d27f82830352ce03764/tibiferoxaxufasideso.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396eab26e4e---76660553809.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9cqosu6ac9rufebfhaj6plt6i9/miwukexobonu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/21642396443.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/dowaxavenepiriro.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109140335162747.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/49957247797.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/84224803849.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/73245992659.pdfIn PDF document text
    • http://vanhacollection.com/images/files/2503819223.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/28033032334.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/40064406918.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/buxotemasav.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/defalolekizejoweko.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/13739751654.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kexubajugavixuduwin.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qco8nsthh5ler4ik3komv0n8s4/85306276673.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/lakubewuveri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rom+for+redmi+3sPDF 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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 19648 bytes
SHA-256: bb7b19669646a09be30a4429048ed12bff56a373837dd5e8672d682c31f5a9aa
font_01_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 10324 bytes
SHA-256: ebbaf5336dd70a6085889a29f26fb546553131d97e242af552a7bc0516f01b9b