Malicious PDF — malware analysis report

Static analysis result for SHA-256 e232de2c3b73e60a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 04:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8adb16039baac4e28ae5a7cdbf06b421 SHA-1: 65244bb231d1a54a7f2a5c0d4a465bcbdfe808a6 SHA-256: e232de2c3b73e60af9e2f3b7339e19234476bea68af29732fa9ced68e450b9d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm pointing to multiple compromised websites, likely intended to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=how+to+erase+search+history+on+samsung+phone PDF link annotation
    • http://azizavacanze.com/userfiles/files/dedewuwad.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/jowijojuzitilejasexiveke.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ferekeka.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/75598897453.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/10471730550.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/r4jpq7j1e80es22d0qiko1vc12/xigaxojovazipatinamo.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/bipob.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/53653956110.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e1cef660---47539642296.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/73239716302.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/1962355075.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ee499eb2824bfe2a337906556fa85e73/gogumajirijug.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/74325050819.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/79430967560.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/25561003782.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dmng367vofd7vj8qmjqnr7k79d/33935243568.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/92015701140.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/56752818824.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/99367737035.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/69456483114.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/benuxotefese.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/jizofeduzagabigagasejev.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/dupiv.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/88436924794.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_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 11064 bytes
SHA-256: 31771ffb7eee8a87838eaa07c5fac0d89ce1a981f6230be36db0558ce4c37964
font_01_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16520 bytes
SHA-256: 8f5f36988b0b87b198e2299d682037709935065a4fa872eacddfd8521164c1d8
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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