Malicious PDF — malware analysis report

Static analysis result for SHA-256 485b30ea4090b53a…

MALICIOUS

PDF

93.9 KB Created: 2021-08-22 02:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40ff154b4fac9fe393097acf16530502 SHA-1: a4583a5ee0ce8ee1a12733105d1e6bef715a607f SHA-256: 485b30ea4090b53a991373b5182aeb9384227051269c5bc6c41c56c15b3eb11b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=telecharger+louange+et+adoration+congolaise+mp3+gratuit PDF link annotation
    • http://urs-certification.com/gais/image/file/zesakemusixubexugap.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/df9jukv7u09bnqeo5tif99ta7b/6348766947.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/wakaxolaliwubikoxarusin.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/belegexubebiti.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5727982e967e16db887c708917f7841c/fikafufubidimus.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/pinaxuwazotexumuteninu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/65e45d356b385646ec96de5fcee9b044/28460758881.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2bf9ed2d9---verapavow.pdfIn PDF document text
    • https://faceless.me/userfiles/files/5969638846.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d044e5f5---bojebeda.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/3b5ppv7vjapummprghnfput18r/dadusedusumosijazuwapabu.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/77951316241.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/76234589223.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/44190033140.pdfIn PDF document text
    • http://wdnederland.nl/file/10384355929.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/narupagozaga.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/44602232387.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2bd2e05ca---japitunodusivelexarera.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae784e9664---zoxafekomunanivibaso.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/97871665324.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/60340344963.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108142204007925.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/sabodifini.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/drdhsjimabrs1r5jef7hs2ea72/wojuxi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711a48d30a---xalimaxapetajitorawozo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 21284 bytes
SHA-256: 792f9ef56fd17a0de39af8b0eac16f1ec21b66777dc0f39e8179dd43a56d58bc
font_01_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 16436 bytes
SHA-256: 2987cfb32fcdc7b9b1a02d4f032cd1c61e5585683254aeb9ab929a04c5c0234b
font_02_sfnt_off00013597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAE 11196 bytes
SHA-256: a6bcf0239e0f585e9ec60274009aeb3e30a1feeabe9246afdd05ffe38cafdfb6

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