Malicious PDF — malware analysis report

Static analysis result for SHA-256 700bb7f7fcc52518…

MALICIOUS

PDF

92.4 KB Created: 2021-09-06 06:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d04bb6207b9b89fc46c3ec787883c5c SHA-1: 75de67d6d1faa6bae7caeffadc7d91f99f18c341 SHA-256: 700bb7f7fcc525189fde1641f001e73c6f12ea74dcf8625b9a205eb69a4bd629
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to exploit user trust to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://jrpst.pl/userfiles/file/bukepuwivigiwuxada.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c0a44fe24---26865056532.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210618022140_o3y5jo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/60333467343.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f7cdd2f6817598ffc8de466cfb8c41ff/vefikizosa.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/64838455197.pdfIn PDF document text
    • http://kaies.net/upfiles/21070810091493825882fsca.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/67087707568.pdfIn PDF document text
    • https://maria-galland.ru/files/file/37071791252.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xubilukokodowuluxar.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gapimemot.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/xepuwobudokaxozubesatod.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608248d762b6f---lokibuxap.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6c2d7088dd223849802854908ebe6f31/88895197536.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/zopulujevelimopi.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/12763949235.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da3676a553f---86944276752.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/91433880569.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/fuvibonigusoxefewal.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/46918623642.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/kasilavapisagilafe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d179bb8ae7---sotowikepep.pdfIn PDF document text
    • http://imi.vc/upload/files/73058170052.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/df724792as30rtkuej5ac8rj27/76313300292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=express+js+tutorial+pdfPDF 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_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 19808 bytes
SHA-256: a12504be0cc54c9866109b2a24f18000f585acc77e3b7e6cd31e819dd2c01fb2
font_02_sfnt_off00014b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7D 10700 bytes
SHA-256: d8796dac321ad802f926f1382e9ba81e5b5b38a325b4cd8e65fc56e757429195

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