Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd197488e9db1675…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 11:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d41ddbe85666b3fad34462d5065624b SHA-1: 24951cebe92378b9a14f94cc49b7575357e83ec5 SHA-256: cd197488e9db1675f27d0dabc3cf1643dfc4e4c8171e03f588e1d15f9e1e15ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cada5fcd070---kubozo.pdf In PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/27337860739.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2147dedcf---senolujenowopisokino.pdfIn PDF document text
    • http://webbuilders.com/files/file/nenakifajuxubijewolo.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/13227135800.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/sabatuzi.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/fatuzevawezipomi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb65cc19e79---66975219914.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/kebumifulobidijuba.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3e4e2d14b---67302221873.pdfIn PDF document text
    • http://asja.ua/userfiles/file/tagorabumugixifi.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/jifasugewipojivav.pdfIn PDF document text
    • http://mp-journal.com/media/file/vefadetapokifuvozawenevel.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/baxamererolaroligabilu.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/2860718172.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/80812369929.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/rarotaba.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/12386955429.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/51360978387.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/000e8904fd6efe5d63458ca4c3d9cce4/141123907.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/tonafovewu.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nebupifozofak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=converter+arquivo+dwg+para+pdf+gratis+onlinePDF 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_off0000c051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC051 18784 bytes
SHA-256: 855230b85c15e32936e75134e673d9af3d5df11b310abf05349a4e3cc94b164b
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 11104 bytes
SHA-256: 6bb8c8c286f451e2dff76237c6a62e78731b9f4eae7350c94aaab4f71c090a16
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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