Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff6795f69fa8d82…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 14:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf88a0e6d0d41fe7544b828275a625bd SHA-1: ad143413b9b083c53b0d9680bfda219adcfdc325 SHA-256: 7ff6795f69fa8d829583d2052534b72de6c8596ad8c50595d88312c89bb5caae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=the+last+of+us+full+game+download+for+android PDF link annotation
    • http://spalovnachemolak.sk/userfiles/file/pesajigijugi.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/92308452699.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb4337e52---revaroxiduzojinatezut.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/zalujewolowe.pdfIn PDF document text
    • http://steinemann-ag.ru/xebagojujuv.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/73240287160.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/84225069229.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cdab768c7eeb67db011e21c6fef1cbfa/rasisoxofe.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/finevokopaxorede.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/80992388605.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906024804.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ae6842be2a7f1e5bcf97447da07a946b/52796536145.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/85998488073.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/titasag.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/34292341094.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/mowupuxematu.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/13113636283.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109170546362812.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/84656594069.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/jifuxaxuluwanorexun.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dibiwawuxidurof.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/7343314845.pdfIn PDF document text
    • http://progetec.org/userfiles/files/sebozezelivotexowupaxen.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_off0000af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 10948 bytes
SHA-256: 7d4e68ac0187d950f17603c0edbd0de1e26d9570da4d299247b1a9244f18973d
font_01_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 17972 bytes
SHA-256: c96007c9a10c82fbc3597ae76aaa7e37803ae3fd115730da60448b01bc43e813
font_02_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1