Malicious PDF — malware analysis report

Static analysis result for SHA-256 0932f6a773b93dfc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 21:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d6f50552c9bf00d4d9653689512a3fe4 SHA-1: 7c998e91058f41c52928e4214827b26d1debfb79 SHA-256: 0932f6a773b93dfcab522905cf4b1a52dc928212b5b018d57432fcccb2472379
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.colline-eternelle.com/ckfinder/userfiles/files/1279455043.pdf In PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gixaruw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135816318d22---29571928060.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7c6e1ac05cf3be13dd9bd30ec7c2ed1e/dememafudo.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kawesomobajevixigoba.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/zusaxiw.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/kewovujoluwewelodunorat.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0ecd05ad---59847174458.pdfIn PDF document text
    • https://palet-school.com/files/files/55814431435.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/96626799262.pdfIn PDF document text
    • http://hueide.com/upload/files/39451410823.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/logitewoxamebipuwepo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613432f446156---22298316461.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/mobeleduvudelekud.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961930791a---jabefana.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jgp62km2gdk3tp5ra45vimhhj2/vasirivuzijixem.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/84933496962.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kiwelip.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/selubedukimujuvupaped.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/doxavopunafona.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/25019748616.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/xexotowonutema.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/19886669505.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89d4f2adb55a5415cccb639d928acb9a/61716604785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hd+tv+app+apkPDF 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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 9772 bytes
SHA-256: de54a4d84c18d4746d65ba13ed846b46ba5a570770658025a5ff33b1d87a85cb
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 16372 bytes
SHA-256: 9c4a246ccdb62b03856a7f7717b879324846b4aa5ec70a6145b0d75baf64cd97
font_02_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1