Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3573ab54868c91c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 16:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cfa5f1ec1b5ea4234a32e004b45fbca SHA-1: 7db5a4ab4d84474b97c0dd3d0673a0d7a58000c7 SHA-256: d3573ab54868c91cd81677df61b6176a05625577a11edd29eed90cbbd724377b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=ubuntu+dual+boot+apk PDF link annotation
    • http://acunambalaj.com/adenoto/upload/files/sifamojetomeb.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/13244359620.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210917061833.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ff5d8b60---85751363760.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/86526094030.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/babakupatasomawofut.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jafaximumapowez.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b09c3ab6---dovologowew.pdfIn PDF document text
    • http://neteyes.eu/editor_up/dulipafasunulisa.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a4de4e51b329ce72c84f9f3cc8c81970/69661557402.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/4417075749.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/kupuxunuwimusakedo.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ladagu.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/jowejilivuru.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2da41c69a4fb8f5d398e6abaa9cdd70a/dokumekamilizese.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/7541073170.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/25068076405.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/83100376277.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/jakefik.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f111c094c0---9399743729.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbb9332a4---59951942215.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/kedevifeduxatilise.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/kowerirenuxegapurapexire.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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 10232 bytes
SHA-256: 099b16ddda99c71bf693a919f9a8ac81df16296f09041ed2b5373d46e90a9d51
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 17708 bytes
SHA-256: 02a75b8f863478df254dd80cf74cab184dbebcb53f6ed7be5cc9d32b92f8ac44
font_02_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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