Malicious PDF — malware analysis report

Static analysis result for SHA-256 33117225ac5063c9…

MALICIOUS

PDF

75.9 KB Created: 2021-08-02 18:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ca18d7de0f24b9fe2ba6f4acbe7bdfd SHA-1: 4485da9fa15164322788f6a122b75acf2279ca3a SHA-256: 33117225ac5063c9881c4e09297e14c82be9fa8039983342b92e559303542a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9651e798bfcc4388cbb619def9d54f3d/minud.pdf In PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ufnirv3ootqe297hmabfc3lil6/jisabevekafafojaj.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/92064270852.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/noralor.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/vekevobupizu.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/27815003557.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jinatif.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff7de82894---gujelumuriza.pdfIn PDF document text
    • https://webmenuplus.com/images/file/30782262738.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/10749463671.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/31109984135.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wuferirojowikironuw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9pl4ao5kggrgomvq0mhu1pi12/tukerupajonik.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/38764818427.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/99109546411.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/jidak.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/bubowiwetatupup.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/7105909630.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/30957211987.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8e45950d---zalomaweputafivupejusix.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d660606c---kawigit.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/domamuxibujewag.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa63841b134---lobusosixunowudipozuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=clash+of+clans+gems+generator+without+verificationPDF 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_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 11068 bytes
SHA-256: 6027249729d3cda798a607a9bdb56cfc958d798b71e9c6a591e8033320bb23f9
font_02_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 16084 bytes
SHA-256: d4e3146da3fed2f80f9f52cc7f960926d0bb88478d9aff6a98a03127ed78bc8b

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