Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84a06c460f105da…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 21:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc67d1afffb04f692a36ec9739c750e7 SHA-1: 8b6ddfd949f20fa09e3c013aa10e77e8852507ec SHA-256: d84a06c460f105daee901f70acc89f081c804a34ed0d87bae350cd81c6262af3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites suggests an attempt to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ibrahimalsada.com/pics/file/kagibejonexujotajusof.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/82870430864.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/7125038639.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/70154540249.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/medigobogamid.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613706ef6c835---fuvatipeboret.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/78627545968.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2774f85d---fobevafutag.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/82394386432.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/5391612813.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/75591250148.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/7923708985.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///buwemew.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/3757596620.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/99067149872.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dfb15299fca1b55e26f6d8ad714b255a/vibusenenis.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/89889678419.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/7670656627.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/mabitituniz.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/49264918758.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/xodilovotevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+transfer+my+music+from+android+to+iphonePDF 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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 11132 bytes
SHA-256: 09c69518bc94a4d257983e9dcb49c76f11a24ff14961f1d46dc0ba25c35df84d
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 19044 bytes
SHA-256: e9c4b029fc5513bdef46f1dad2191e52ad5d93909de34b437434a19aeb0bcbe3
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1