Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf6d9a54074643b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 12:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec75c559c8fae3033815d3923b65f420 SHA-1: efa5335079cb0ee39481e00180d8f50c658088cd SHA-256: dbf6d9a54074643ba8d680fad28ed9412e4dfd3c2cf07a56c53797e9fcd06db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0de4796ceb63f1d971e6e2153e8cc7bb/kuzosurivunukofifuve.pdf In PDF document text
    • http://nissanotogovap.net/uploads/images/files/73851059985.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/38086765200.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/xasomagutavovimu.pdfIn PDF document text
    • http://topp.pl/_topp/file/56476164398.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f728eb347---mefozumamokekaduju.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/1728224023.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/90737482959.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8ba1d29684cbdc74f077b32e707d347c/3953613350.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724894eca5---67136511004.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/tezazogelimimivewakisitaw.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/mezizelapomaxumewonode.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210904002757.pdfIn PDF document text
    • http://whatdwellswithin.com/file/xivepofegotumulubejejilu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1eb2771b---fegebu.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/58390112161.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/60386810436.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/56642026616.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/80689778404.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/90680718425.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/7325652990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=engineering+student+resume+format+pdf+downloadPDF 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_off0000d352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 11008 bytes
SHA-256: 93a3ec355817e0562ebf07b747932295414e908ecd34b25c3843370a62dc151c
font_01_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 18096 bytes
SHA-256: ea5b21d6779c7bdda0fb08ed4681157b52349d9fd2a66638d571ebb867a4ca81
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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