Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ca994060c1243b…

MALICIOUS

PDF

97.2 KB Created: 2021-07-06 23:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecda8eb4df06067500418131037d4e5a SHA-1: faa6aa95f0ed2cec50c1fe572d90b3a896a0e676 SHA-256: 20ca994060c1243b8b242bf8e978b974d0f194143ec4c5d4b41c91a62b9cef22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous external URIs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9421

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://queure.ru/uplcv?utm_term=how+to+draw+doraemon+cartoon+characters PDF link annotation
    • https://angelsforwarriors.org/userfiles/files/gikoxugakefofifizubewur.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79cd27ff99---ruxewagus.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/japarumuwatenuma.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/987fe2c7b801092aec8887f6c00a7626/20068552184.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/36651033140.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d02d253a9f5aad73e7f8c1e3fa3f40dc/xenukutolagaz.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ff6c73e6---totoluxofuxi.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/87261131384.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6j5shdpebdjs1bkcdjlooc5jj2/90095859493.pdfIn PDF document text
    • http://tao123.me/pro_pic/files/22162425396.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/76106514326.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5a1e5618---2105507314.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/29245689922.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c64e0c148---vivowerez.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d239bfa197e9daf7e16487caceb92b0d/46880176368.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/rosamuvuxotidivotaxirofun.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0607de86---medaba.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/232d27e8f381cc963811464ccaf30d5c/91743429189.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/solejuraki.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/24908258817.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b7e1ee5fccd5468fde87f992b1d63533/95291253283.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/nabasasowemowi.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/nj2cofm907t7o8p9ucisqjhgag/dimukenikowenuras.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/97829878078.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ofjhm2shc37dam2q613nh6r1e1/mevizakomulopug.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/17538992131.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 17656 bytes
SHA-256: 7bcdb8b5ddd090791762e56356a40dad6c2a5e7688b4a807a94c5e6f7f52794d
font_02_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 3184 bytes
SHA-256: 1a22faec293ca25eb02935b6d9ba4962b9d332304d8046e1f758f56cc9ce4d8b
font_03_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_04_sfnt_off00015e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3C 10572 bytes
SHA-256: c5f8d73068b2c597787382e16a49ff56a304ebb39921194f631fc994ec8a06b0

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