Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b731ef3b5dc7242…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 18:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e4aa09057a6500957b11e6ca6dab64c SHA-1: f3ba98eb161e1c58bfb517bd08193bfcb61b16b7 SHA-256: 9b731ef3b5dc72429d42ae6bf993e228ab9b025883d825118860f7be8fc5a1a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it impersonates a cloud document lure, aiming to trick users into opening it. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://watch62.ru/files/files/vujazepinojifu.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118f452b08---girifiliperazesifoje.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/sinerixupofozada.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ktk1m6eu7lj2hhfoa2r4roa778/75736983818.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/71372286744.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/josad.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a7e613d3---zejumamapatagigisuluzobik.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/42060642821.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/geles.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f28ddce27---pilif.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210905_B05334591F2DD14F.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904060134999996.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/wujejanopikukuviso.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109101357445160.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdaeae4795---60180392816.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/30229304831.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/safere.pdfIn PDF document text
    • https://kede.org/userfiles/file/72768453543.pdfIn PDF document text
    • https://campermagazine.tv/public/file/libagugevarowukawuze.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0536a6c5787a877c963eb218deb90ed4/lelajozerurodoguweti.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/sawat.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/tadixowapuropedereki.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/42969c549999f18f268b768df921c84f.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/simowikavivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=iphone+11+will+not+send+text+messagesPDF 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 17484 bytes
SHA-256: 4e40efe862c2302926d8c3ef5dbd9f04ecface3f6fc08fa4b70c122189dbeb2c
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 10928 bytes
SHA-256: 0eb3045d47e7902dd628298a3779fe60dd5938a051f1370dc908204d4547bd08
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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