Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a7a89c4e40a8d8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 11:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62d520c9ca3a65779beaac2d4294197a SHA-1: 11fee8e6a3a2bb9772c8e93434cae359a541b94b SHA-256: a6a7a89c4e40a8d88bcd781d23c0dc449f2ee8349d51f906c8da1e71bd5f9015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4eedf8a5e749a872cd25f3eff2f6be25/19656379580.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/7817312334.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/49105061035.pdfIn PDF document text
    • http://blueyee.com/upload/file/030820268924.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/30785062094.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/317e7cbcd6bac8b5747028f476f495b9/78888038947.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/38591100049.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-18/20210618041715667253.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/fubegegigex.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfae97540f9---64157583766.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/24447826136.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/bujadomajitavire.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/720246f82bce2bcbdca14126d3d3fc1c/87590623882.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/witenutebavakodedib.pdfIn PDF document text
    • http://atomleasing.ru/media/File/dopidanive.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/bezusalidoritir.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/23948976911.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/89016522282.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfa072d65---78229743135.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/70354162824.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/be4fb16dc9350026530a43188486a3c7/7007510981.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236ed95b25c---73313406303.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/folojigirofasotogalawegaw.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/pogegaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=requirement+analysis+in+manual+testingPDF 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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 10736 bytes
SHA-256: dc256b3a37e66f0035efc7d865c9c567da1e759e35c8b3705af255605d4c9707
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 17460 bytes
SHA-256: 43f68bd9af9741ed0d29674bcc02d4d4dc5b9ed21f6174e6be00a82d9a6474f8
font_02_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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