Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c51cbe23d40abc…

MALICIOUS

PDF

81.1 KB Created: 2021-08-25 17:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8a510db89cc347c9610a5dab7e69c6b SHA-1: 99a8ab9683bbc42691ee1e187e2b95d68841233c SHA-256: 21c51cbe23d40abc9f2091028057eff0105bfc9615cb2df147a16c3786d20924
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 malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=main+energy+levels+definition PDF link annotation
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c1b5bf93---94501173749.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/77762105179.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/xodudumebotumagesas.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/2702962809.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/90975036831.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2c6e978c---73357199447.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/losudibikejitop.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zisevulurapega.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8ac5031110ad8b1ce5cdd300f88792b4/jizokavibufuzuseke.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/nujurirafofokisalito.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f462b3b1a0---82228489199.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a72fedce4u919vktb61mbsaol/63918392876.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kolefofojatuvapub.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa118d042---88731283317.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/kilegonone.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/venofagokibekij.pdfIn PDF document text
    • http://headrepublic.pl/images/files/lebel.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xadowitofefimiraxuwuges.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea7f382b---73935376026.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435d84c308---vulivexalutudulakexox.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/65778659441.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/32542737435.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086e94da78c0---93974541078.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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16612 bytes
SHA-256: 436f0c43e000cd027afa3485cc7194ace7df387a7ae875494bb60793baeaec0a
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 10700 bytes
SHA-256: 27c9aaf61c189e9cdaa622915a61b5d594a442572a36f8b7b16762b11122f832

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