Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309eeacd155d54f…

MALICIOUS

PDF

80.6 KB Created: 2021-06-11 08:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a956559cd28c504350e99a242e6ca8a1 SHA-1: 308d9a73619a7f7993298a6f3c31a9fddc4a65b4 SHA-256: 7309eeacd155d54fee9251d004e4dde76814e25555c2821440e4974aa69a1e7e
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, likely serving as a lure for a "Brawl Stars hack client." The presence of multiple external URIs and a link farm on disposable hosting, combined with ClamAV detection and ML classification, strongly indicates a phishing or malware distribution campaign. No scripts were extracted, but the document's structure and embedded URLs point to a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=brawl+stars+hack+client
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/05de96a64732845b4e8000136522b1e1/durixetedoralosejefifojo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc57c827d61d26fcfb5298881f86e8f2/nedananagitexologoj.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60b52f57b---89282344466.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5n48fjkbq4peihrhaqisrk19a5/38835802882.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/46a8349b75ec90bad95537f9a7dbc4d3/dafatizamel.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce668751c---siwasasapuligarigig.pdf
    • https://anandamsanyal.com/userfiles/file/29602174508.pdf
    • https://codecs.roimages/file/29904492189.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b02ce2a0b27---zesovaxabuzejabetapabodur.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c74b64491d687fbb249746be68321b8b/74839317370.pdf
    • https://flardochform.se/userfiles/file/felurowav.pdf
    • https://baohohoanglong.com/userfiles/file/finawe.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217f67b12c---24413816905.pdf
    • http://whuntex.ru/userfiles/file/5775911539.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994cf16057e---legudasigaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00e.bin
160f93b3f06cc0c43c833e307d11b7df8d4ad44caf6f2ce0bc2a71d6093eb1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 4768 bytes
font_01_sfnt_off00010038.bin
70237f8adc94bd14c4053721f66981144967cad4f235a61b062385fc057929a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 11248 bytes
font_02_sfnt_off00012565.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 4324 bytes

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