Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be0c099d3411930…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 11:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d28b69a71fb0f70c802132457adf7fd SHA-1: e8e657ea1b4f139e9e9f22082fe67d64a0a79705 SHA-256: 7be0c099d3411930020216fd4d93c2fb30780488bad52bec86de6514ab8d3682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. It contains numerous external URIs pointing to compromised websites, many of which are hosted on WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=korean+meaning+in+nepali+pdf PDF link annotation
    • http://nujhimachal.in/img/uploads/files/gixodasonarajodi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sku40r9eujvfi2mmth6442khu5/75220616507.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d02c3fcdbce---wawinujigig.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce89c3618a9---62740514140.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gunatej.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/semasujumowided.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f6lkmrrmvtaest7n3ni7sdqu9h/38959523521.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/gidefasonep.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/zobujowef.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/gunepajiloveranedatoron.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pq270fvggmo21e1mn8aljvlmr5/77762774496.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/74572111568.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d2cefecb---46888032660.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/36844287209.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/pugot.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31116517259.pdfIn PDF document text
    • http://kfbi.ru/content/file/96764113844.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/mojisatuzeguz.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/rukikepol.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbb9564f677bf979ed04d7b86e61a1b5/1374307966.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94570449643.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/039ba4bd4f00a7c3ed8495fa572a7441/bumekekomepaf.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_off0000aeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB5 17176 bytes
SHA-256: 3f9558d20663e11ef887d14b137296f8ec14d547a7ba1980a19b94edb3964cae
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10564 bytes
SHA-256: 95cdd18128666ddb5efaf37857b3fa0c73fc296089d4bad97c7fd3d2e2fee0b7
font_02_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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