Malicious PDF — malware analysis report

Static analysis result for SHA-256 241f7b8d205a665a…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 03:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e0e06c30e9d17cb4690ad07517713b8 SHA-1: 8a551fd3b01470256af7aef4e7045851d3a2ad1a SHA-256: 241f7b8d205a665a15980032c392025e0bc6da67a8a6e42d8eb720e58b985879
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=myers+briggs+test PDF link annotation
    • https://073741256.com/uploads/files/202109081623143837.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/59025168840.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/87386367907.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/natekokigodusekepe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139081ad0251---11835447686.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0a62b74e11fef174d35d3ba21ecb288f/87770756005.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614841cee9c4f---soxezigonikowuzed.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/rafukejivabavi.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jejaduxupuvituderejebetir.pdfIn PDF document text
    • https://allianztc.ro/files/file/zerazofibaduselemeturovo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/23123619336.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/peduxukofupugasi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9371f0d56---xoxidijudajutaramukawuno.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/30674363792.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210922183549892294kt306t.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kbfjtod5icn78ot8betcm8v28i/48760253678.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210927003541.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/2764753689.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/35655334163.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/sefofidijodago.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/73954446386.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/vevutoposivim.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/mezoxexebuzijuxamef.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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 18188 bytes
SHA-256: b4f49fe27116cecbb25054ef9e2b0294edaf344f126ab285c267962c64ee81c6
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 10096 bytes
SHA-256: 8d0d22ace24c5aa20dd7d607783642649bf746243d2f7313732a78463fc302db
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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