Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a9690e45cbfb04…

MALICIOUS

PDF

105.7 KB Created: 2021-10-05 01:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0d2819648c2b23ee52ae2b39693b497 SHA-1: 4d80c0f6e0c251fc2391ec8d20ab10cb52a956ef SHA-256: 89a9690e45cbfb0418077765068bef659bea9bfc9af33262b8c67774e84fc46e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://wastran.ru/uplcv?utm_term=nuclear+physics+books+by+indian+authors+pdf PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131471fd45d4---zubezakuwavofofuremufaz.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/jorijaxuxera.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4551cb51---53079230313.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/zulezogepikum.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137deca2a974---vojeluxorejibapuv.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/1d2e5e.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/36935196038.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/47651818907.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/sivufalimegi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/4246583384.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/fudotijinofudanalite.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/87333701037.pdfIn PDF document text
    • http://tipiland.net/upload/file/23760732580.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913214331.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/jomojisadevese.pdfIn PDF document text
    • http://soc-in.com/data/media/files/betubabipesibeviw.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161572e8d9cb67---59766782713.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/josatimitolegoji.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/48770206401.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/nujit.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/59908639010.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210921_CBAEE36A8CD2FC21.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/bomudomobusodojofi.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/6190190754.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210923065657.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/12423198743.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_off00012bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 11140 bytes
SHA-256: 33c287f795a4a4c66a8ca333f4e86f6b6c19af7352940503bf4b32794f225f31
font_01_sfnt_off00014585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14585 22808 bytes
SHA-256: 8edb8cdd010535d2118145ff91367e51e61d96913c86ad30c802481a4ab2e84a
font_02_sfnt_off00018031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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