Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bafb5ed07aaa394…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 06:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cddecea1b11657c8c3934613aca172d0 SHA-1: f82edce24fb26b3bed26085baf5be433631ebd02 SHA-256: 5bafb5ed07aaa3941f526315f51c214d0454946d6f8a7a49c4c5c643a1131719
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • 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.
  • 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://izumrud38.com/ckfinder/userfiles/files/befug.pdf In PDF document text
    • https://andana.us/files/files/getaba.pdfIn PDF document text
    • http://bwc.lt/i/ragabujojazujode.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/57254784298.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ucebcea6r1qof880r448fe21rb/zusate.pdfIn PDF document text
    • https://stvorki.ru/files/file/92267942736.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/budakaneror.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160710d46b6e5f---babavipon.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/lokuk.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a03aac670e7a8ebecdd9ff078d35c550/jajinojajul.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/13667944456.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/bapojaxiniper.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/rigosufagila.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bafev.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd88b7bc85d---61395425840.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/mudabutafen.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7093a8e5c4d78cc7d40974e67209e463/lotologubuvila.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/bavegorozibifawip.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wepufipe.pdfIn PDF document text
    • http://prosquash.by/data/58837610272.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210813_C78257D959690B31.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/tolunavamozobazubedot.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/zoxoratopabavugevo.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/putuxaxujofonoxojekav.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pubavuribixopagopufuveni.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/fofexafini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=whats+the+difference+between+manual+and+automatic+transmissionPDF 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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 18704 bytes
SHA-256: da67388038405261fc9f85e24b535f6d45e76a429f420e201d743bd894465b28
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 11060 bytes
SHA-256: de853fc9963752f349d943458cd5f4ade18ffb9be76096d0987dfbc6cdf48536

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