Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f72afbc0815dea…

MALICIOUS

PDF

82.5 KB Created: 2021-08-07 11:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 526c7dee8892de43cf3c9c0bc3c18f8e SHA-1: 5946b8ddb1863cde7dc2abd19d308138629d4571 SHA-256: 53f72afbc0815dea9b5d2b3c6a8efb20e462afdd2f336e62406b3a6138809801
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://krisoc.ru/uplcv?utm_term=carrom+disc+pool+hack+online.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=carrom+disc+pool+hack+online PDF link annotation
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qc5l07oifq15ffenmkevriok4d/rosib.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/94609448582.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/81443081791.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/30165194746.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be34c8cb6e---81314730822.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4179572db3b81995b7d99035398f9fd0/jubatisotuxuvitonexozovog.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/65505798575.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zuzuluneji.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d407224d4a---63849717965.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fb38fa8b6tv4t2f7n60oe4cac7/32470109303.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zufofogedodidina.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/22749941582.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2dd94aa766626eee63ba6cd1f541b373/bukatixafelurovepeni.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/19623021360.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ca1904002---xumepipop.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7beecniojmqlpss7rd2kb7maj6/nutedotelibijenekulutaleb.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/95886086767.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a748dd893a8---6351275887.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607760c214a42---31359563876.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/67986886500.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95bae042782c0c9d1ce8f3abf8d47ad8/kisetinakabe.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/35276667706.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/2506318284.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/27144392481.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/bafaropomodapatufakumarur.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 17880 bytes
SHA-256: 4d2f4ce7852162babda035ab1ad64fc03a515d71d82d0be94c6d585e16f06313
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 10804 bytes
SHA-256: 23295bd2b86301fa21f4e636f1e078c6865178259bfb9e01483205bd822db3a8

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