Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd14df91c8ef67…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 03:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63f522b718370a4dfaedaa22fa00789b SHA-1: 819c5c122f52c52f0a09f82a9836128f83b497f9 SHA-256: 6bdd14df91c8ef679ad86777246af64f211489377c5624a7c3b9377f71edc1bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by directing them to malicious external content.

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://crysiq.ru/uplcv?utm_term=analysing+data+worksheet PDF link annotation
    • http://jp-photo.cz/soubory/files/xaluvijerexal.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/62702012830.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5i2iasth385ugn4ubnempdlo45/92979601438.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/texumadopomuz.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2def96a67---nijariwozanigurufugadise.pdfIn PDF document text
    • https://goldenapp.net/file/42183960367.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/210c4a7f428f9f40619a054e948a1706/wejibekirudetiretovet.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/jijotiv.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161263ce805ff8---zujabarojenifamilota.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/28645467821.pdfIn PDF document text
    • https://robertbah.si/files/file/65482670925.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fonedeniwikazire.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/10477224214.pdfIn PDF document text
    • https://seikai.jp/free_images/files/nomuju.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca96472b3c---xibowalonugobuvoruto.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/56542186618.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7b10d3c8f0a3ecab31095f639e8c1f08/23690383408.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be484ba7d56---68970708624.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/kijakozudarofedi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/25400260736.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/1755682777.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/963e0295ee171bf57f37282aa789d73e/kuxara.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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 14576 bytes
SHA-256: f638f96482db9385111a811d6519bef1e41762ac41ba4bb227de44e86b19e73b
font_02_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 10800 bytes
SHA-256: a427da663f68b83f1a7a9dfd845d4b1b390a04b0e90096f7bae1e053061e5372

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