Malicious PDF — malware analysis report

Static analysis result for SHA-256 9865a7469683131f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 09:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55a8c8c17b272e4d6d0775e4e55398da SHA-1: e36a96571c8f3c8b02a94b5b08fb9719b2916861 SHA-256: 9865a7469683131fc176e96d1295d8e583abec56a487925b1dac545d83cd6909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bharatiyabhashaparishad.org/ckfinder/userfiles/files/71480229320.pdf In PDF document text
    • http://vinczeandlaszlo.com/upload/munesedolixosutedaxutogi.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/53974434790.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/8291158561.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/8182499047.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/xakusowurim.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/265091546.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/67828652904.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/42136752997.pdfIn PDF document text
    • http://sharedsynergy.com/userfiles/file/70229372976.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a4dbd991546af5927374f226299c5d68/motezovekasemurizazuzapot.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/jajibokoxomuxabufeluwem.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/92882298362.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/69144259438.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/6448360918.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/7684347624.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xasufub.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tunipovebel.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1faad0af1---wikujikibakepodi.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/99439026340.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/siviwazowugelix.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/milujuvinixubusa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b5e98062---18586655387.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/serolugolaziviwo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/kazumireborudapigos.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210905034619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=carrot+is+good+for+cholesterolPDF 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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 18256 bytes
SHA-256: 199186876185cf9cc5f168c20b5db7172c686e932210dd40648e98b744791b4f
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10684 bytes
SHA-256: 8e24a9a369255eb60624e35e3a5475949eb4af6c1c06b6dd37501a3e67166a2a
font_02_sfnt_off000128cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1