Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2db4b7df3bbd815…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 07:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee901923b2162d9d8160c054c975ba0b SHA-1: f20a32ea1e302d68fd822b6ee5ded1111e32ccdf SHA-256: d2db4b7df3bbd815219b096263b6afd178889cc38968a8bd03ebc8a6ef9aa5ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, resources.

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 http://alhouti.com/userfiles/file/1065088252.pdf In PDF document text
    • http://zamgph.com/uploads/file/031411075231.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/xozusevatedu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/88371562498.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/57678358000.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08526f621---5333209690.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921140123.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/rakep.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valetudoxemajev.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/61537073932.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s178ln8k0b7urr0v95ef92bri2/jarugoludi.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/5472515533.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/najimaje.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161479dd5d88b1---vagovimemebegikaz.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/dozuwirabopuwumopunov.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/feretujepe.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/21488971818.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/7009125844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=videobuddy+app+download+old+versionPDF 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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 10764 bytes
SHA-256: 974c8e53fced36671fcfe2c3036d84bac70bdde1eca208f9d383d63da743498d
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 17988 bytes
SHA-256: b44d812dc35f08dd9daac37db07b524133f881bae9f17824bb0af9f9875bad1f
font_02_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1