Malicious PDF — malware analysis report

Static analysis result for SHA-256 662f85e059d71c36…

MALICIOUS

PDF

98.5 KB Created: 2021-06-26 21:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 74abff8cc24eb3be897d37eaf4f13285 SHA-1: ff17ef38f17584924152093fe8e35010788cde42 SHA-256: 662f85e059d71c3602f952c425c9bca0525a6d99448f7f434393c11ea21612e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the presence of multiple external links points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=hypertension+and+renin+angiotensin+system PDF link annotation
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4e31d7ae48491746bd8f8d809aded55c/98915998836.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/unplg0k1suhkuo84cvh1gkijj5/6364189592.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/10451297079.pdfIn PDF document text
    • https://coatielectronica.com/files/61442829244.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/zagesabuxobakobiwo.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/wakuxitirupavazobaxeke.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908efb04f9---77755769254.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26db7a5a1---51940326175.pdfIn PDF document text
    • https://angkagenap.com/contents//files/28747432795.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/kevikalokobugijukono.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/sitakupejugupuzegakaru.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e77cfcf4---55014056791.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/13219816584.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/tpi9urscmrkkgqkdbu4mlhrn8g/papujev.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88cf2f35b8---lesewonumad.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568227bbda---21584279245.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3n6rb6g6243m5hikh9o1f5eokk/31280756390.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d498693ab---56461960451.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/49408620749.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/92386192185.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/80c1c26f46e7c421b220205c519b4e86/50077139543.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_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 18144 bytes
SHA-256: 06c4220bb10d57d571d1ab4d3d9341d3e098a1a1dda7821292dfc9d27f8afa7e
font_01_sfnt_off00014c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C08 10796 bytes
SHA-256: 206721fb6ef63195f3487749566a00d03682b01a61d6d02bff1a1cb6ed17b471
font_02_sfnt_off000164ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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