Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6324998999094cf…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 01:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fab26d95753397d062a4c0bc94bbee41 SHA-1: d99317f35393863f6fedf0ed2ac2f4f51548f251 SHA-256: b6324998999094cf7d9b1d65fd8be85f251c7fe466474d01d0411e300ac55018
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary function appears to be redirecting users through a network of links, potentially for SEO abuse or to serve malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://schubert-hh.de/image/file/savuga.pdf In PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/7312197624.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/60586082258.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/gajowiwumam.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/zerodejivo.pdfIn PDF document text
    • http://midel.me/userfiles/file/82299596253.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56a7ece04---97076632186.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/38a3125e102d41af247c396ccadbff2a/38592556797.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/barofoderotufegonosezagor.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/32611381870.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c4c1b744---tikojizojuxewoz.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd46ec81b---66515740750.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5dbe06b0e---baxotukofisipuxexoja.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e7b632fc428e969781089a9e4b819a4/sigaxu.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/86780740457.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/59286903684.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/kefuxolotametugukez.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/rakisusanevafunoxipuz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119fd9a4b648---62375132693.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/99392943926.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fccc7b37e6d---pozizoferidezemi.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/gadimojuxewobuzizavoj.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/61044007011.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/fewinagazuwarigeboza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=basic+pharmacology+definitions+pdfPDF 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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 11236 bytes
SHA-256: 720f4e8f592b5b0be29b43b488547f7ddb5cc23ba602ec09caa3f3e8bd1a4a78
font_02_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16232 bytes
SHA-256: 33e67c1a7b6c5a13067162ef70ca80f5ab3bf734f3df754a283139df050bc961

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