Malicious PDF — malware analysis report

Static analysis result for SHA-256 8073a448dc101085…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 14:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0884275958c81a29c704bdf549d4342d SHA-1: 744b3d910a50f0906df9b352b54de232321d5025 SHA-256: 8073a448dc10108531881d2c7c8ff2a7c5d3cc78b35dbde10f967452a68d00d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent, with the link farm acting as a delivery mechanism.

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e118e5ee---terovofebufanuzuputoworo.pdf In PDF document text
    • https://quangcaowebsite.vn/uploads/files/92136864653.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/18e67af8e37ae39dc094dab347a89ef5/kewosuraderegid.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fc42c03f6---49539766756.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/fusotusinodavamuxejimo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78d332f42b17397e82591a215f994879/nowekizusawawako.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ro4i71pei7fs9ek5eia2fkv5ki/loluvuxu.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/wexozubukuvisorowowikop.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/ziginezabarusu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9392c36bd4eec963a1507817346073c6/8263546787.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a25ea6f92acc420da216a3607ed09abb/mipija.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b05ae1fb0---64769272879.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab323405fdf---46944819585.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/55576322908.pdfIn PDF document text
    • https://kuepancong.com/contents//files/85514147704.pdfIn PDF document text
    • https://polandpools.com/contents//files/75147769261.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/bexuregezibe.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d63aea84572---35477922032.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/rupiwugomojifozu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/529d2b9755171a0155e079dc78b0747a/97624643972.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/69233905409.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7qgd049lbl1ratkijq94bp74b2/21009194089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=of+other+spaces+michel+foucaultPDF link annotation
    • 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_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 18136 bytes
SHA-256: 6af17670e76448e33a508f4098d95878c8177ecc1cc480236732c71e885651a4
font_02_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 10764 bytes
SHA-256: ea758e7e2f96a6a2c8c40c9240f3a0dee0f1822c23456f8dc999ed3cfdd48430

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