Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad64b2cf4b8dff15…

MALICIOUS

PDF

172.6 KB Created: 2021-06-25 06:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4c30ce85a07297efb1ea1bc32552839a SHA-1: 3dd8d25a378d935bcbfe7d818a70a3311d0a9695 SHA-256: ad64b2cf4b8dff154506116a4cd083b9942c5b5106c0c3309a08a2f6929b9563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malicious content or redirecting users to phishing sites. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://oniceh.ru/uplcv?utm_term=naruto+shippuden+episode+138+english+subbed PDF link annotation
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3dgfi3arn5q43hh1fbnoq3hmm5/53646269563.pdfIn PDF document text
    • http://cpils.com/userfiles/file/tutiwume.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f59ee4f1b0ca98d47f2758583c64a997/79773684797.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8ce3e8f49205ca013c38c84b537d630f/rakepugajesob.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bgkaenvn6tkanl007223uls3e0/radisin.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087709b247e5---82505094568.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/il0jpu11hng1ffsnomc40eh9ie/banusimigolokudoxu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wefejuwulu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/21150f774e7b4ef711583c80522f9882/1663211984.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/gedafeliboberazato.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7feac312---7969717646.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/subumizasupinomawibuka.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jf5v20oeh5i5hk7ts3sp3fkl7l/31415944622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE4A 40064 bytes
SHA-256: 10fae91b775aafb61bd28fef3db6bf37e4193635d02abd02dde443b0aae3d6a2
font_01_sfnt_off00023b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B2E 5740 bytes
SHA-256: d15142d2fc73660e58493cfc9b653956e59f24594aa93745e6313d4697f60a32
font_02_sfnt_off00024eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EAF 19396 bytes
SHA-256: fd9a93e9a8935b003ef14d895e34d694ed0cac1a8b623e98f2f6462a803692de
font_03_sfnt_off000282ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x282EE 20012 bytes
SHA-256: ffd612f934a8287c64657d510cdd4d2c836ad511c1aacb0ebc51bc3be599d5a3