Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6ee75b09223735…

MALICIOUS

PDF

85.9 KB Created: 2021-08-19 16:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 129b28bd1dafa77e547336954902a9ef SHA-1: 51d4181347433481cc34861cff595a4326c88218 SHA-256: cb6ee75b09223735f5d0d5f2e615d29be6547777f8a330345460bb414fa7a0ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=what+type+of+ownership+does+nike+have PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610095550d533---fiponexemus.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/77714568090.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gogimodisiruruvemizo.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/35919081630.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/pisamajovofoz.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/pewikigufesujevivul.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/j0sjhne44llrb73i0200c2dut7/95936002031.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcbf28a619---52858512459.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/53a72879f79ba7c510df41071ab0ae0b/nitedemexuvitumu.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/kolewitajibodifix.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fijavogigomejilewaxesofir.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/nutawalulagekupoleror.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93749437f0---pewup.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/kuvunosexeramokefavagajit.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/44653371324.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4f36a7d75---tumojikokovitikabisomifi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wajuxewufidukawewoletilu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/578560927018f395d05f65cf5dcf37f0/zofovepudesa.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/ruvagakoverifek.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwegezo.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/movuzubititid.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/61f670d152f866057b1a575db0194bcc/4938538712.pdfIn PDF document text
    • http://51www.org/uploadfile/file/8e0f87986e0fd49d796362295d1b70bc.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e606ce558d---mokafowixi.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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 10900 bytes
SHA-256: 4800412191b3b60795f0a3c0047c45c251aade7c162afad1e7fd2125330bf694
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 17648 bytes
SHA-256: 8c1253e35354b4d817e1666be0b8d89df93c30f9faa750defe776618d05356ea

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