Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c27ca1fa067c364…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 08:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34350f30b0a81ed90058974934fd402b SHA-1: 5dff6c19d25ca884c94bbcdb21be4bcc92e4bfb3 SHA-256: 7c27ca1fa067c364dbd12d9bad7524246561cd57bbb0393c7c6922fe5d2600f4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://seasonmediagroup.com/pic/file/39009694545.pdf In PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/13375451993.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/pefupob.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410966d96e3---rozevotadetunadupufeninul.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e06e9222585e5b25b33e0ece50d47c5f/dizorar.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210912_021926_193.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110611b8cb---50058250573.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/38561818346.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a960998a42a2afec49632a8e0406b15c/14616524391.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/jorekewa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa63f3999---97882388306.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/bokiwenagafawib.pdfIn PDF document text
    • http://newo.ru/files/files/kebujabubexebopizevojaje.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/tutajasavilofab.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c37e34336---mofago.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pjpteapd5p5v5p797th5np9kvd/795015509.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/95722273892.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/322ac599fd9bf6fa1644386c39cf3d9a/rakiwafonefixefabidav.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/togutelofunatesogop.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/7329545256.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/tonofuruxigudu.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/99451413472.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/57107429513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+themes+for+androidPDF link annotation
    • 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_off0000bc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC70 16432 bytes
SHA-256: cd85be3afb9019e14342ef8918bf52180d6b06cfe0b8615d545ce95a9d60da48
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10688 bytes
SHA-256: 2f61c47f26f04eb8cf20d331b08a31e2e1392eef270c50458665156aa4973a4a
font_02_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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