Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b0ea1de3086ddb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 01:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: febd37578579b01fb08946b532eb3dfb SHA-1: 2c15e7bdb6eb2f011c0c34faebdcd3b99c25fc38 SHA-256: 30b0ea1de3086ddb1ebcb7fe5063408c2fa077a7fe246d24e51a25f64a1c20ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, which in turn host other PDF files. This suggests a multi-stage redirection scheme likely intended to obscure the ultimate malicious destination, possibly for phishing or malware delivery. ClamAV and ML classifiers confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irisapp.cn/uploadfiles/fckeditor/20210708/file/16257103507428.pdf In PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/xunefuzoronowavilinajol.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085464fce612---91385421542.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5a11916796430abac6868b7d540193a1/54956568158.pdfIn PDF document text
    • http://indexone.ru/upload/file/nuvepinivorupoxelider.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/48446076253.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c3565c86c56be2d7e0b37f7be1b9e6eb/68309595147.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/07g7siadl2r533taa2p9oo70j2/depaw.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/topaxib.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/papewikeg.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/6087441416.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/56607070611.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/20158628259.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/nivozoxekovadosaxa.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/28046112773.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160912336be34b---feneledotasekogataral.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e54be324---lijufaxupigi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nuvukupiweba.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160973e5dc1ed8---zesipozomibazodomanap.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7o15jr16ss2mt5mlrrpvsrv9iq/90598879198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anti+procrastination+worksheetPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/20070049243.pdfIn PDF document text
    • 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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 17088 bytes
SHA-256: 8bc8f8dd385628d91c22b8f1ed2fac21f5fd9c129c5d7489608dcbe96620e13c
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10584 bytes
SHA-256: 99c6d8d00d2ecfb9482942423aa7cdb953eb85ee2cb61bd4aa88fc988c2aa700
font_02_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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