Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfd4a5a9a4a449b…

MALICIOUS

PDF

100.5 KB Created: 2021-08-06 19:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7a4b7a93b5d8c971eb63904e0601d656 SHA-1: eab1c7af487521152ba072a3ff7007b55916345e SHA-256: 9bfd4a5a9a4a449b5cf9ba325514fbf85a146ebf91bd1ed69b565c4ed9e2cd0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=hd+movies+bollywood+2019 PDF link annotation
    • http://dobre-jaja.com/Upload/file/97934594448.pdfIn PDF document text
    • https://soechi.com/userfiles/file/17364655266.pdfIn PDF document text
    • http://djpress.pl/Image/files/53866554770.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c36103c37---muturevavekik.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/6146380885.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/nazizamumudugixupezuv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160cabf71dbd4d---68485994491.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/xofineji.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeaf22ced---sixagebadiziragiwo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9b240514---woduxonozeranu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751bc9aadb---tasovifipixiwajojemiwa.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/95853764146.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ae409ae92df2a9a002ea8a177f049c68/lemelawamidirotuwagupog.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/9577870862.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4c8595ab503b8d0908b7e15ba1ab48c9/tuwebaz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160716d4cd407b---nepiwuxomoxerowuj.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/92621762027.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/rudivekitewobirazedi.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/fetuzebakonasigisis.pdfIn PDF document text
    • http://medica-brno.com/files/kaziz.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/seroled.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1ad4e4a2e194314534aadfb962e9df41/noporivizomabinotaxage.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4762a8a5be29e19b22f19c7da916e073/92494555152.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/84677802757.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_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 17552 bytes
SHA-256: 7ca1014894cb192d85be8127fef21e231054cc0a33e3e009e1b82f0b71a53faf
font_01_sfnt_off000152a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A2 10804 bytes
SHA-256: f5ae39604b69ff4dff40087ea6461f1d538c9e9864f789a6d0f65fc2fc60e9e8
font_02_sfnt_off00016b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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