Malicious PDF — malware analysis report

Static analysis result for SHA-256 d696dcd8bd4a5e7f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 21:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aedf1553331cf2e20671498cfe927214 SHA-1: 4398f3a5b19690b31f63ac2b09fffb172152d42d SHA-256: d696dcd8bd4a5e7f00f87a9d84a44b6975fcfdb50943e5f8a68cc0cdfb0f2dd1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it functions as a link farm, pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious external websites, likely as part of a phishing or malware distribution scheme.

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304b2ed1ec0---97399212795.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfac7ca86---sudejukupuzokobek.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/74690871680.pdfIn PDF document text
    • http://elsped.hu/files/file/zugarasasulire.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/6176376872.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613719b9d5474---77053247960.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zebami.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/mabemojuronanotix.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/sagetubomumikolak.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/tilalagarozimag.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/79109432017.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/50640909504.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383f58d4621---miwamew.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/panasegevebexelusa.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kiginategerujezugoxodexuv.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/7476858897.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/26889229370.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/14186764073.pdfIn PDF document text
    • http://skncn.com/u/files/85996499732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=coding+gamer+apkPDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 10548 bytes
SHA-256: a1fa846180973c3d4b962627d8464159c29d1ea8f17c4d5fe8f7dfcb5fecbf36
font_01_sfnt_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 16964 bytes
SHA-256: bd98f68e912aba6781d84c1b08355738980096bf4b7e93c2a25ed557c3b00aa1
font_02_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1