Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc2a083bae3dcdd…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76983ca31a6a94d329cde06bdf621cf1 SHA-1: 99824c2f8ca6c497733b13fda940f95c21f442d0 SHA-256: 5bc2a083bae3dcdd1b8be394cc4292d837b033792f2e0fc4bbf86cafda3d1875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, with several heuristics identifying it as a link farm hosted on potentially compromised or disposable domains. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bluecars.pl/userfiles/file/50425313020.pdf In PDF document text
    • https://soswzgierz.pl/web/uploads/files/fosokijem.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/76338ba183b506a701974cd04312a065/68109281681.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/35377085876.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/kizevoso.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/75710178819.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/48756820409.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/54208471022.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jasivezigudewisukarisugo.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/13709961285.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dbfd4530a31d1ab073af91fa0459b256/37783410066.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/65061740183.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/sobabuxexeruzexoz.pdfIn PDF document text
    • http://adice-area.com/pictures/files/44316482186.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/jozalimetenejosalusivu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613234bd722a8---fobufeva.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/gutibesenujoluwafoxi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bajemikosubusobi.pdfIn PDF document text
    • http://elsped.hu/files/file/sirekeralexiwadi.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/49855693625.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631528628718770076.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/maravim.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d344c6b885---bogudamowuzuvasosejeseke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+studio+voice+to+textPDF 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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 16536 bytes
SHA-256: 76400dbff667c1b07d87407b459c025df4b815e8bf1d65cf08d757c1b81beca9
font_02_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 10404 bytes
SHA-256: 7954e4e31c85c22f8383d05696eb031ceb37acfc9f213e362993248edb09fd8a