Malicious PDF — malware analysis report

Static analysis result for SHA-256 b045da236d42966c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 08:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 725f1c405cb80d0f50e47a980747234e SHA-1: 78304b589c79989b9d88738f23de8f6457ba8fbe SHA-256: b045da236d42966c5c4b80b1cb135f81fdda15f506925a4cfcea4a3ea80264a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of multiple PDF link farm indicators and a high ML score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qsqaqlcnladdd3u052a59mleuj/16084162904.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/39830185445.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109040807454347.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134abb551b2e---taxosoj.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/25515358232.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/36466485737.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/5012503010.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/31572254474.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/92141635504.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/gitezejefipadisekekupe.pdfIn PDF document text
    • http://dentistturkey.com/image/files/48570940999.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/sabozob.pdfIn PDF document text
    • https://dacola.com/upload/files/vizunu.pdfIn PDF document text
    • http://iscelenie.info/files/file/xadukafidamepidi.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/zigirejebifasatuzuwudutak.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jadunevarabewipununafuno.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/vupokobe.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/27378124919.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309919d1129---gegemexufefi.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vekopijuxuzoburigitotamip.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/kodevegumasadivir.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/xugesol.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/pukujaguzevi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4ae3476f---81683644153.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091407503773499.pdfIn PDF document text
    • https://desco.scp.hr/files/wileledonurexizuxu.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/4922444689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=power+bi+exercises+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_off0000b379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB90 10532 bytes
SHA-256: 59810048747b2440af24ef6512b8a9f1ac6ceaf276f8da08a4134510dc4c898c
font_02_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 15656 bytes
SHA-256: 4e495af9e3ff2df5082ea09436f5d70541f4380a26b5af9e5bf66e4102973289

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