Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fcce22bc2fdff6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-14 13:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29403f88e280b10d9e8f7932f2328004 SHA-1: caba54c008b578ddfe115f867e6abb5fe32245a2 SHA-256: 79fcce22bc2fdff603ea05b308334ac68c39a1fa08828b5824360687d8404b9a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://get-insurance.in/ckfinder/userfiles/files/fokisujemotegebir.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tesasuvemerikikomojik.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fudusiwedugozibukame.pdfIn PDF document text
    • http://rayanchem.com/d/files/6196390335.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/besosagazofafekijafaf.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/34875945443.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tanopumadi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nonepizopivo.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fatevuxas.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0e8ee011---95666125442.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/74637248818.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/27781471972.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/marago.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/99100277456.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kewowatitivagerarugi.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/guxepupepikuvijafogiz.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jatowavuzagajiluza.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfaf02c3f---gabevukolonidajojaxuj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135350a9790d---bupufuwimozu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/11180661402.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/52069091265.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/22691360902.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/neromu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=install+flud+for+pcPDF 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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 15292 bytes
SHA-256: 77fbf07a972fc6ae7e3d7f812b0154637a8ab2ee237f3e7b3a68179959dfc59a
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 10440 bytes
SHA-256: 9dc2562e6da14bb4f7efcc765ffcfa59ac181359716295654e7b231bce30d0bf

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