Malicious PDF — malware analysis report

Static analysis result for SHA-256 5972f6d9862b2c64…

MALICIOUS

PDF

68.3 KB Created: 2021-09-21 10:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64fa36b771bc0cce579879f2b13e58ad SHA-1: f66c470e3b793542c44592e4cdf48a615370e104 SHA-256: 5972f6d9862b2c645fd7c67b1655dbb76f67e85736d66a7cba1e623b5748b24d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=leo+privacy+app+download PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20842f945---sigepanap.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/4969066844.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/589670239.pdfIn PDF document text
    • http://web5gstore.com/Files/files/kadabekukorifijowom.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487740aa3c9---porov.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/20779148927.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/8670784439.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/l7vciprvnrqf00esdpl8u8mjib/sesam.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a209843a7a132bd078e0340cdb2c3d33/jivili.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e49c372038833e57f8445391fd7622ed/renejazezeromoxonuk.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/28442476667.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/vekisum.pdfIn PDF document text
    • https://stormester.no/files/file/91166891248.pdfIn PDF document text
    • http://elitacasa.it/images/file/49812150757.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/86101078389.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/xexevuzaz.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/nukosobofebizopeva.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/dobekunukilola.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///55321706891.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/zerejus.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5chce5g0k1qscg9bdo35d9hfok/64531675287.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/27599897026.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_off0000af34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 10464 bytes
SHA-256: 0bb85d90173890f5e2883ae42098adbd18163335989d2c4a34c56b6697c480a8
font_01_sfnt_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 14532 bytes
SHA-256: 67c89193ef5e041bb896e7fdc643689d40315ab0acb6a5967b0c5e3edf52ecd0
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1