Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33842ee35cb41e0…

MALICIOUS

PDF

82.7 KB Created: 2021-08-24 18:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 477bcf3fcd7dfd228bed68a39804c140 SHA-1: 72fae5c6290eb6f59340f108c3d2d0871c7620ed SHA-256: e33842ee35cb41e03f401d559aefc855ae66a56f055caa50262a2c8ef09fe1a2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URLs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://wastran.ru/uplcv?utm_term=words+that+ed PDF link annotation
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/15814126023.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/228aa95889f521c84c3c9883c7e97419/kovakewugizusudasovafezil.pdfIn PDF document text
    • http://c-six.it/userfiles/files/100338291.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xarul.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62c3dde2---63846095422.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2hr7ubrfu5bp96kno2kbnugee1/36442915069.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/poruvunafimatitinaxujek.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078277d03064---luxis.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n643q9q1pt5lubf8ro1btrmsl3/73770132993.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90a7ac29d1282f300eb5d4df89b12656/76233728755.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/45481030016.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/meruwaxomebiso.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/21545620691.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ff008a2c---buxamiruto.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da4e8cf6f---mulebepozurukurodatafe.pdfIn PDF document text
    • http://capableapp.com/uploads/files/sajepafisivit.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/43891868429.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/pixefega.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/29554421277.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080720615e66---86382160727.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9829d40be457f34a27b3d8c5a1dcf7a/82289019281.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/62859216949.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509153220492.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742c1eb0ba---4013894292.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda6e28169---9388576526.pdfIn PDF document text
    • https://bfull.ru/uploads/files/57450544445.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 17116 bytes
SHA-256: 1d3709a326c67cd903d811618f65d6cbf6ed6655fad3199cc11abacafd52dc28
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10096 bytes
SHA-256: b2c1bc73bfd4ff338131f0bae2acf20c12253db58d82e90536f7556ceb7bf54c
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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