Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c87338870741a0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 19:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2aac4028af6e92a6152eb43154f3b2d5 SHA-1: fe32e67280b68b109b8c2b3945ef526c4f96a435 SHA-256: 77c87338870741a00f39be88990872a69cd115e874b7ca37c55306b488d91615
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=unity+ar+android+tutorial PDF link annotation
    • http://gkz-crimea.ru/userfiles/file/36934804658.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/51848212660.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3e3981826824eba24a71bd70d96038a/96245828501.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/69o1qjeitdembnd796hjec7br6/59824091360.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/52428991579.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wafojanizokejegikikexiz.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/walibakon.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38b891630---73859630529.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca410a121---20611012061.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/wukafadunefizenot.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/potuwotofimugizibineb.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/35040559490.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/japanegoxewuxevawipezase.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/dusuberasisutunurarabi.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tabuzeze.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/pibewelaxopukumuvobisad.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///54416415547.pdfIn PDF document text
    • http://ellev.fr/upload/files/76781672553.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/zamotabepemabiwi.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/vinid.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/jemamotezetovexoz.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/27589883544.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wiwekile.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 10160 bytes
SHA-256: ebc3a3afd021fd9612c9437b0d19b4bf2042a5cab3b3bdb5fd1be3ad8b5e2211
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 17540 bytes
SHA-256: 76ae271e1e7b449ae0077906b8495e22dc44aa36c34068b3b0a4a9f12ecf4bdc
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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