Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc643a36c5861fe…

MALICIOUS

PDF

83.2 KB Created: 2021-07-13 16:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 510d4e1816d0db0443e63ca06f681ac8 SHA-1: 28025f7c0b99f324779362606ab5149472d8592d SHA-256: 6bc643a36c5861fe38fa3bae9a5688670423cbcfd08cde352382799dff755ad5
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. Static analysis revealed that the PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

Heuristics 5

  • 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
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3074d70638b8a122b81bed5f1db2cdd3/15006836223.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67a527f93---16894248275.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/403ea17e28c9306bb89bcc944edd75f4/72700627872.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a662d7c1f---86587902119.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/gezifosaf.pdfIn PDF document text
    • http://imi.vc/upload/files/44596653523.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lupufebuxogif.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1cad57d22---68571968012.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/xexinovufesujogidenexudi.pdfIn PDF document text
    • https://mvservice.it/file/kakamukewumedoza.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qmkdh7mtvk7fc1vgvapsbh03gu/mepumavoresomekegit.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/87325390952.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4eb31c0e---vasuz.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1c98d8a11d493f1f5ca2fc5e7ef0e784/letoxif.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1a29ea48---34885213604.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e25813846---58113455560.pdfIn PDF document text
    • http://dges.in/userfiles/file/87597932515.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/tukinuwasitugufukakokobe.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/31678101605.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3e65713d695cbee7f1e09ffcd2b58ab1/pobutilaziwofibekesojipe.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/78131209062.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/65420656235.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b025c69234---95745112075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ncert+textbook+questions+and+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10960 bytes
SHA-256: 12ac67cdc7a684a1abb374acf37556d5dc198d59e5b537db1e93f71f7f80cfb3
font_01_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16904 bytes
SHA-256: cac77ff2457db10c55d77dd1752c784c59613defe773001d538b8167e86b872c

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