Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceda60362d1b32a0…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 09:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7238ecf4b05f209986ed9d051bc3795d SHA-1: a8c81fb03877ac8470c8440cbaf737b6b7988972 SHA-256: ceda60362d1b32a01371ae8197146d7ad9303c15647c57752578c2122396b0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a potential download or redirection mechanism, likely initiated by embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=9th+grade+physical+science+textbook+pdf PDF link annotation
    • http://kamnitikamini.si/upload/files/xaruxinipo.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/76974661047.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d681e87f54b2ab2ae2b64f4a156b4b7e/pujakadikuxepegofufugax.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/33edea4cac278b65996dd739f4cbeeeb/15281647192.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05315c4cffa0393d55437db18558f994/dikemusemel.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa2001145---82645206452.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/niludepoferirakinezar.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sawigod.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/roxelizasiba.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607207e685d9b---powovesojakudopuja.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/99675471432.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/mojiwaju.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9fd9c78f2---wuxiviwugufuze.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807912c2df6---jivuvavoj.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff4079965---savaragiduzedumereti.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/fosipewutegif.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa010eab54---96237131053.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/e55l4n3ribt2bv0oold7q88fvr/73742641603.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/05/file/20210705_075206_146.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16080251044a87---77702789836.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/dirazimirize.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/fipebapupejefupaf.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077152fe1e51---lileferituvujonawex.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/22386898987.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17faf86b1b---25474767011.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cma0eb24fil29rtqbiq4mnuiu0/19820026394.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a835bce8b2---78017670040.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 11420 bytes
SHA-256: da31498f237e859c97d0303b7cf2f7c5383237b4fd14e8a2aa64bff5d99c610b
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 17328 bytes
SHA-256: 80eab4b2b491081a8899405f0f090de40b332a9c1df9e9583ba46f6929a50d66

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