Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d258e785b980086…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30863f05b4bc06303d844ce5f720a46c SHA-1: 3690bad45c4bccee7f6c6ceb4b83b16c69961396 SHA-256: 8d258e785b980086a27162332faf2c1dcb5c8165cc2f4161788121008aa8c0f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=higgs+domino+island+1.62+apk
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/tirivufelakata.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd9aed1b7---mavodadodukika.pdf
    • http://wmc21.com/ckupload/files/43244018069.pdf
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdf
    • https://4cmedica.com/ficheiros_upload/file/82690002949.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vuzeruw.pdf
    • http://abw10thstreetne.com/uploads/files/87214226052.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/80527608880.pdf
    • http://dison.cn/filespath/files/20210904165227.pdf
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/tefodetosoguz.pdf
    • http://arcstema.com/userfiles/files/23747550333.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pabedas.pdf
    • https://eravukappalpalli.com/userfiles/file/25632878709.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613815c2ed4a0---nudomutekakuxaxoxos.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/84636ea0469f9c46b88619ec5520eaec/latobuzasamib.pdf
    • https://servingltda.com/userfiles/file/76757686599.pdf
    • http://yh-nutri.com/filespath/files/20210902111041.pdf
    • http://acudrved.com/ckfinder/userfiles/files/kubixolibajedekeriwitobog.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/16333356666.pdf
    • https://fruitssupplier.com/app/webroot/img/files/naputijevuwunolixir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c775.bin
471fe713f7a6ff4f03849e59fb0adc447a0d090ed478fc8665a07419a17fb7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 10896 bytes
font_01_sfnt_off0000e062.bin
b5403280f3a0b9561dfabeb6ed8b11a93800d1af86b5ce32e39ce291db80f6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 17824 bytes
font_02_sfnt_off00010df8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 16792 bytes

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