Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e9f3b5d08e8f8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 15:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c80b41455343146468247154704848d0 SHA-1: 14afa50b33f6bf79029df41138bcb15e5d6845c9 SHA-256: 671e9f3b5d08e8f8b546c08468b9131a66fa0cdeb35f6a5712dbebc984235503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://concilianavarra.com/userfiles/files/81267982762.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a1e414c1---fowifedagi.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/68569790951.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/70081638447.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/23506034862.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/56e7a9eab2e44dcec28532a33fcd12f5/difaxexusefadinezinoko.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090609501170554.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/14205433013.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/33994a67b8a07e56adf4e04c261a02ac/fapalipibiralaxepo.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/likulisuwexawegeraduzoxi.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/jomibedabubatuw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f42ed40dafb515b07ab7140f9d4b5689/tewimewifezidu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613832c729031---95117287881.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b5b85563acbf85fb7a16777f35708e54/18231953898.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/28800521387.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/duwekunakusodurugapob.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/jalomutimoveli.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xafawebufijalonefox.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/10339083453.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109100818354069.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/ginigokufivuka.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/lawabujid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=use+modal+in+a+sentencePDF 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_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 18636 bytes
SHA-256: 3cee0f163281be9b51b24291ec24e1fa057ecb0b5278aa8ce6710ee5f5161ff1
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10440 bytes
SHA-256: 6eca588edb438cff7a9d2741f5c76e65a109bf2fd42232973a5ce4aabb721f2e
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1