Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b996940d3d6c70…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 12:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b37313c447cef317fec838e5cfc60efd SHA-1: 9b25e42ced1337a7a581966e001476b5bddc76ea SHA-256: 96b996940d3d6c7010276db7c7343f5cbe1774f24c15b76ce8b141b2dc7c05d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/lubefezo.pdf In PDF document text
    • http://mdknoodles.co/uploads/files/70952388143.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dawejukuwenamopatelus.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u3vm9109ff3fq0tehpfvoclo46/zupututexeb.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/41350629002.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nopafafinelolivuninunu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/togefutorikiwajavaj.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/64424783024.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3b46f044b697633eb0559f18af2a6a7d/36160836223.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/53161030372.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/robebenabuviworakon.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mobuzupow.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/jeboros.pdfIn PDF document text
    • http://hadt.vn/upload/files/77074164569.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/21232373521.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/gozomov.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/58132424308.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/96004785458.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/wezubinekikesovibazesofen.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/78273033691.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/77e28cb8a4fb90061cbe458d915eb047/limagisanadakam.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2d1dbf787dbf9604d7e7fa8fe6e0fa55/37933764936.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tofajaxirolakaxare.pdfIn PDF document text
    • https://tigaintan.com/contents/files/sibilufufasatesave.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/taxuduzaduget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=good+facebook+hacksPDF 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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 17060 bytes
SHA-256: d721e6e0b6397c710047d34b43cb786f73ff647a90a6a8e17880b1f3e1cbd1c1
font_01_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 10404 bytes
SHA-256: 6033a759589d16fa217391963eaf1737d842e99f009aa7b65e7aba79420744b2

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