Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2475077006dda6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 23:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f48b48dfd02a01796d60d486ab2a096e SHA-1: 591ac4ecac06a9d8eaa40b7d3b799bce681b06ed SHA-256: bb2475077006dda6aa26df0360d4bd16e4fa176797462f4f3c98fba790fe4bc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, further indicates a malicious intent to distribute or host harmful content. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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 http://dongphat.net/upload/files/38521969786.pdf In PDF document text
    • https://comfort8889.com/upload/files/biwozovusoduripefex.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kawulumomimekatoge.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/51589479363.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/badevimevoxubomeranugu.pdfIn PDF document text
    • http://unsersohn.com/images/file/levorujaduk.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/napifabo.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34717556642.pdfIn PDF document text
    • https://iword.de/userfiles/file/62602377777.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/89780917218.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/81490672442.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/56cdd837e9870caa9570e46aa82473aa/wizuruziv.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/42080076024.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2c70f505---1890711957.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/57208619586.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/nanulajifawoluzubagidaxi.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/tozalazolixegatorug.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210905_051352.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/74701141833.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1c019de54a671cb36e805b697f670142/kimotufeledupaba.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/40623640800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+train+your+dragon+putlockerPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/61372175707.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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 17356 bytes
SHA-256: bec1fc3559e9f71f5b6cfd1d1ae967756272486af5324c0ccead75a7ef217c72
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10904 bytes
SHA-256: 388706bbd137ffe7e6feb3a284fddb7676ab148c955045fd43c5e605856108cd

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