Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b293d0633b74c00…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b49e3a954837ac29f51fea414a6e0dc8 SHA-1: e857100bd3e81b5e786eb615c9586ae133c147d4 SHA-256: 8b293d0633b74c0055ded8733a1ac412652b21fef6dea02f46eb584977402486
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various download sites, masquerading as a game download. The presence of multiple compromised CMS upload links and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the overall structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://coretry.ru/uplcv?utm_term=gta+4+mobile+for+android
    • https://oddluzanie.net/userfiles/file/18155723499.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/56pamgclbe93m9jsmotkg08fp0/lugewugiv.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k58glsojs0rp05u1nh37bgacc7/dujaxagerukemox.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6796d63e8429beb5e3b502a7f1f9780e/63670102881.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/349175d590f026160d33af9c2f01c1b2/30497425267.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b1e391f2---64768855562.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/flus3rvsu8irgauhdn3ji1ja8e/lozakabimerizibisu.pdf
    • https://calmoinc.com/upload/editor/file/49753481070.pdf
    • https://actor-conseil.com/files/file/zukajese.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160931ba899a58---natotijekubevenujupu.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0f9e0c0b658b6e7322afcabc83950860/jogonumonosatos.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/q9aiupangs4o121a7t5592biij/82891064224.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0d40eb7b---67877298218.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5c0aa67b---liturujomedowenonijezawe.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d15796336---69384891398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbec.bin
4186eddb24ee8d11dbc991a77bc9abadc60abc8ce688337db996c027867793ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 5136 bytes
font_01_sfnt_off0000ed56.bin
fa36a01338786e8de0e698338913195d2830faedf2c123c9bfab63d77fb89a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 15280 bytes

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