Malicious PDF — malware analysis report

Static analysis result for SHA-256 522126dfb21f6e40…

MALICIOUS

PDF

85.2 KB Created: 2021-08-08 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0783bf7f56ba7b7f29d38dfc4f3f00 SHA-1: f125b2ef7dcd1273c4b46c482a4c281a9d82f8c3 SHA-256: 522126dfb21f6e4051b848b2a9848d918f0542b2905547c6fcb2cb577faff01a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=basic+engineering+circuit+analysis+11th+edition+solution+pdf
    • http://irk-yoga.ru/upload/files/92747180763.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077afd3d846b---655748438.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/dexolabegokamagi.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c496333d7dcd690d8723d58c5c66085f/55554591757.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/wabalirititanezakejopu.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c0a53f6f---sekivanusoja.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rclrbfepbm3ms6leteajurn0k1/jumurojenulapivo.pdf
    • http://degrossier.nl/uploads/file/32380176002.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2fp98qmu2fcklm7pj1qkjnk8be/35788936700.pdf
    • http://rentbucharest.net/images/userfiles/72247757218.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/4051228439.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/nisad.pdf
    • https://motelandratecuci.ro/userfiles/file/sixet.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f9cec1ed5f01029304c7d1d97ea16de9/vesikeg.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qlbra5icdf9s2lk5tasffavk0q/53894974989.pdf
    • http://cesurmakina.com/userfiles/file/vodibedasitebusopakagi.pdf
    • http://perlawarmii.pl/userfiles/file/39692035553.pdf
    • http://epoch-making.jp/js/upload/files/bawanuxinenefobov.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/funomunilelepivakixaxus.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e362eb6a---zokaguxakuzavag.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc5e7b56c---xepezewebasu.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40984f27a---48853928354.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ba801ced---3848810692.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 16792 bytes
font_01_sfnt_off0000fdc3.bin
36128447ecdf9f002b0b74d05d6b7b29b36245c792aac26304aa4f0c47dfcb48
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 16976 bytes
font_02_sfnt_off00012a00.bin
1d6bfc746c4447c2fa01d56c68bb328b9e0d300f7f9425f21aed52a58018935e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 11216 bytes