Malicious PDF — malware analysis report

Static analysis result for SHA-256 46147bd0baf3c468…

MALICIOUS

PDF

89.1 KB Created: 2021-08-09 00:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1ce75bc458ddf834d2bd520d5e9a25b1 SHA-1: 647efe53684488621bac4df58e0c10ca0ad7e877 SHA-256: 46147bd0baf3c4689b9132cfef745dfd513c4173d443f56e3f05f9335d335b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+report+sky+broadband+fault PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876f790d20c---felaget.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/9396521279.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d532df272174bb87c76632c06f8617a4/gatajugiduv.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1g0c14232jk76gd12uq2q3aura/babug.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9k9qvahrtgt9fs0c1ptmgeuo4r/fasojajekafuledimijojisi.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/2c3736ae744089dfb272ec498adf3346/64796784456.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1857eb1a2efce4a48724f5db093981b2/rakebanosedodeliwipivu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/91998673341.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/38l40tm0u5ha919i26tnb0192k/73842752430.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/rajonipusikudekewonofi.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/31456049371.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/18f4188c1bc804d50924ccf90f5ff63b/12423674973.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/55829705000.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a25eeab3166---wulekugedunomimuxugag.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/waroxiponuzo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/78688931860.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0cf505ba1ce1d635d8b6723c72610912/44826015922.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ln47q1mgl89cunc29mm0jirr5h/pisatinojipokun.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gotasar.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/509406b10972c1b875fcd78ca703d823/9831625684.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/52a1108ef3015b91a8e434d8fb38c2ef/394422953.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/13527533948.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161052e6b18aa5---86374673516.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7e564997a6545d798cdd88ca240c742c/28758524689.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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16120 bytes
SHA-256: 19fb3e0837d6f9ee728c5331d7bb33e1bff3d595bd4ca4a0aae7833d7d421d60
font_02_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10920 bytes
SHA-256: 3892d5a0512e64475d5e0ccf44ce8037d813a6e3c5d0cdab078fdc6115515f2f
font_03_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 17964 bytes
SHA-256: ce3f991ab15e2dec3bebe581c3cd4265332710d152929808df128860459e6463

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