Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd405ee8fadc41bb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 19:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7305ced67febd2627e1408fd5d9411d SHA-1: aa6bbc879552fedd833a510179814a37611782e3 SHA-256: cd405ee8fadc41bbf954076b27d7b1316052541d82d4ba5fd21e1aae7d719064
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=gbc+emulator+android+games PDF link annotation
    • http://bmfjhjk.friend-match.com/upload/files/gipisujisakifugobalogu.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/16425538661.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a09e24e07---75744036792.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/84189906910.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613347a4c2dc4---3132390732.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/jarise.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/94319868144.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fugumolimigajofe.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2740999821.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/30248856744.pdfIn PDF document text
    • http://effekt-film.de/files/file/bekekifavunufamobazoru.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/movix.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f0417e9a---70027273620.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/54194663954.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/66456344560.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/11158712992.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/28097797318.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae6949ab0---39032962251.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/juxovowirobelefirika.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/gigikisoditulibojoxufileb.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/33543559072.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/22199523276.pdfIn PDF document text
    • 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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16936 bytes
SHA-256: 3476da5ac1fcc3a0d8880f174a4827081978f9524c647567dcebd7473fedb820
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10992 bytes
SHA-256: b586106627832f027142f5d903df23fe2ca2e0ed8bbd0ec7d348e2005b41de2b
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1