Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cf5ad234c7d0f9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 00:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79a4759ccb06da7f2e9788a179204fc5 SHA-1: 1e3168b6bdfeb64bfda5b64f622f2e223d631d7c SHA-256: c2cf5ad234c7d0f98ae2c86080cb9bd1808f4c7f983458cd8796875f771bb66f
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting. The primary attack pattern involves directing users to these potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ldcpc.com/ckfinder/userfiles/files/momolifakarovupamewijaxa.pdf In PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/xebisu.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/wunivebosujitizufidirap.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/87494967107.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ddd442cf1---dejazizejoxovumedugumazo.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tegerawetibik.pdfIn PDF document text
    • https://kaparatt.com/images/File/tegomixevaw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161464de36771d---27473363030.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/iu5i6uu81r06tmbggubd9aahhk/gezulanol.pdfIn PDF document text
    • http://only-svet.ru/upload/files/ketoridevokulus.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/matepibudapodatafozopev.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/getej.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/79643069592.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xexedulepo.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/61546384519.pdfIn PDF document text
    • http://regmac.net/userfiles/files/zofev.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c6781393c7d595aaa0e8f2e50533051/rebipoxozavefururo.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/jinijapofa.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c8c6a05c1d1c2b79a6ebf75cf66060f9/kamapolitatopubedozi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141505ce05b4---95481586985.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/91184755889.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/16268762276.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903081707_vfl3m6.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/88547818508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=griffiths+electrodynamics+book+pdfPDF 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_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 17316 bytes
SHA-256: d564b9bdae36cd76592e7233350901b9f662a018b2bc72fee14a0ebdb29489a6
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 11268 bytes
SHA-256: e14d4a805cc99489ab5c71a4c66b4e2ca08b99e87110aa97c0ac3dd5090847d1
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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