Malicious PDF — malware analysis report

Static analysis result for SHA-256 57662842ef252959…

MALICIOUS

PDF

94.3 KB Created: 2021-09-17 20:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 191d814a708b77b077c76094abfc9ecf SHA-1: c7f5ed1cf166115273c9d699d7c9326761ba61fc SHA-256: 57662842ef25295933e2a96ffd90ea97ed4e8313e067299b5bfd68d10a7de44b
176 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload directories. The document's structure and the presence of multiple external links suggest it is designed to lure users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bluebirdcanada.com/FileData/ckfinder/files/20210910_50A70A8D36B0274B.pdf In PDF document text
    • https://12shio1.com/contents/files/88767750708.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/24275419068.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/51250261340.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/podejigaxi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vawamubafisuvenabimi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jumutakup.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/85939689685.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90e5ccdf8---5983885143.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8a69f01d1c2150a79e75bdce416b50f5/rafovikodivamasedux.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/vakapobevo.pdfIn PDF document text
    • http://zgic.ru/!upload/files/6955949170.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rjaj7hpe187cdkp9mah2qhsrh2/64069697585.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/femifenabiwofub.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/64431757711.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/17301636173.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f8pujbrafsvf9s1akate8m2na5/25469891564.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/vuxadusakawubinub.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109161206265779.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/bosagi.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/53127502238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wheelie+bike+2+unblockedPDF 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_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 18744 bytes
SHA-256: a3afddbffc2373b64e23a50a95c6789ab5af3fe13fbaa94c6d44cc7a55d1d3ea
font_01_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A8 10384 bytes
SHA-256: a82629d9dc245d5b9f7cd154f248958c0bab8b89b58afbb493787a6778510bc9

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