Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8ddb80f3cfeaa8…

MALICIOUS

PDF

74.8 KB Created: 2021-06-15 15:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e205d1fc68ca9b57e9b8cb1f8316c7de SHA-1: 77e07b5b8d95ef03ed0eb03a6c99d11e4c4a886e SHA-256: ba8ddb80f3cfeaa84a8b3a1daf32b500613a144b526417f675948a0a893fab06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit user trust by masquerading as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8394

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=babylon+js+tutorial+pdf PDF link annotation
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/51214206631.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb56187816---xojoxut.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4d5968b06692365fd5490b220b944cb4/881739226.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/pomadumuxusukupuli.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0uouq8tie6puuh4m06fdpla7g5/xotufidadurutadipok.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/ladukurobekuxidixar.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/ruziser.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072586517596---3843923381.pdfIn PDF document text
    • https://goldenapp.net/file/loribowiw.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1fecc9ce199cab12c0d1b8ff0916d2ad/wuxibake.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02c4c1dce0---dikotidodawixuseman.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a90876d69---15743581835.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/11962278727.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kibasarulenasutuvebevume.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021053114435290.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1p6v91n3a1pttir7uarnnd0l1/58625167885.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/18615357336.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 5404 bytes
SHA-256: a0d9d4ff4bdd4f4159eb93cc38a3e88b60655229b5fed3bc4c74b651f781754a

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