Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9432c8e01b9b1a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 09:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b687fda9238c5fc6e1636f008f9a5ee SHA-1: c391aa37d457e2b0bfe8845dea40756753b7f907 SHA-256: 3e9432c8e01b9b1aa401e14cf5886c5e76e8c6bff4222366d8431b4b82f7b953
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16138aaad6a4bb---duwosumamorajegibadis.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/lodafubore.pdfIn PDF document text
    • http://mamitobe.ru/files/file/19777083687.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/turizife.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/43326831296.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a8a9815e4815885ab0a31ba3ea263fcc/bijizuke.pdfIn PDF document text
    • https://12shio3.com/contents/files/wobuvenefewososubax.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/30896668438.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130260f0ee47---46355567043.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/71432477026.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gesefabefovidenaw.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ragopatutapadowalel.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/dafatowaxusow.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/ziwozol.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/lejakadivirexelifij.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0ad938a1---29281374729.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/21246551774.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/60851677283.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/17592677450.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/xozopadisaxevi.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/josopop.pdfIn PDF document text
    • http://ssp.by/var/upload/fajusuxuded.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/pirabesuxapas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+hide+pictures+from+galleryPDF 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_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 11260 bytes
SHA-256: f76b1a63b6e3d3a1846a52f3d244045e624b26934cfa74311af22ec3f7d69e84
font_01_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 17212 bytes
SHA-256: 7d3dc6dd3b1c5f2403cf8eb35fe84ea8ff45c2d549eb262362f11490990c5236
font_02_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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