Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b0511d25cc1203…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 11:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b3790975a153b25fbbf5c993a7186f7 SHA-1: 2538892310ac58ea96c7c6e4c9980140a1433575 SHA-256: f8b0511d25cc1203828de70dbf4cd79105cf9acb6af8dd8f27579fd5182e46f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload storage or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users via malicious links, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7816

Heuristics 5

  • 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
  • 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=ftp+server+for+android+phone PDF link annotation
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/jekuraje.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/54789360735.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/tarovumanapoterelugu.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/51184398867.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/51738040510.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/47983474468.pdfIn PDF document text
    • http://merwepizza.com/upload/file/61713333222.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/21706409514.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/zotafaso.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c0395ce65483dff981c78ff2838f6633/74048261319.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ac718e41c5f596ae1a243bdc8038503e/37697789840.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/5458570967.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48034836987.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/42568762033.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/powuv.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0v8so4bdng9jqrsr3a00j38kui/69901068772.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/83525743117.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/tedasenarakesevosomiwusuk.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/xisofodowebirapadotife.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/nukusasitib.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/raxalaladaxis.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/fukozevusedilewirewiroz.pdfIn PDF document text
    • https://majubesar.net/contents/files/69416464274.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/19758e98f2126b262b7c2e4ab492d71c/vebopusumidapiwavepexubut.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 10592 bytes
SHA-256: 88b8dc0e0d15953b4e7f05f1d864e422a15f4b18faa9c81401492e96408bf718
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 17856 bytes
SHA-256: 51a9e20e7af327c1c5026bb1595e5b7e1563de021690476e987ebe65d57ca1d9

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