Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b25849eb5cf014a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 10:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5529cf095b9b89c9e57f62411d226498 SHA-1: e508e260aaf8ca03166b5d60f4f8130a933e6c89 SHA-256: 7b25849eb5cf014a2bffec557effab85b33331abc37fd6ee5f241da9496ffb1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://thaiboxes.com/piceditor/file/vifuwegonep.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/figajumabiza.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/7356298357.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac78c3f8c---nidanakugibe.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/kuvigegejigizuj.pdfIn PDF document text
    • http://oodow.cn/upload/file/210609055947286456dv88wiwev6bd.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/10073528214.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8159ec83---85287900857.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/nekitovolizo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd1980bc0---55440617158.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mugawevetanuteraka.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/xurakujamazopisine.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/q4htno6i1ufb41k189m0bj83vk/76091200904.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sogokabav.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210612_09FF661BAB91BADC.pdfIn PDF document text
    • http://xtra360.net/campannas/file/tifimijimiwubu.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/vivolisenuj.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/b6rtk49tkjgul6opviv2epvs65/52400674308.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/45675022772.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/katawi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hlar5iihts7qc54eg2e73bgm9i/veveriwom.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/790029117.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/tozotexogenogegizaruv.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/56a1e8a156ae91a43b765e9fdb6d4372/modofikazunafedet.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0877c057d---75285730829.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/52302969321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=earnings+management+pdf+2015PDF 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_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 15768 bytes
SHA-256: 0268dec892b0974317172b5594623725be446dd9310b0276b41a99f35be32089
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 11084 bytes
SHA-256: ba6ec475c925be0c0f87dd6ebf52d65d59ef464b0634500865784c47be33e55a