Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a7e10deafbdd03…

MALICIOUS

PDF

81.8 KB Created: 2021-08-02 17:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 891adab15c012ad1bec8d4068554f539 SHA-1: 75e99bc8f010b596a4801983bc54c0feea4550b1 SHA-256: b5a7e10deafbdd03d495fdf0560ab098f9532acc6021fb17212ada9a5bb84be6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, directing users to various external websites hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6346

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://studiodispirito.it/userfiles/file/67826012315.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vldid50dshqc8mkb02hc4nm7rn/72121299666.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d498c419---nokar.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/savolokenelorozuxu.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/nazukatokemolafuxaja.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3c33ef9f---65514849684.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c767d32649---xejusawufenabi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/728f996eb1913b730e4466c7b8f7d437/nelulobaparap.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/55357774215.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070301512197.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2819034bf465e404dc2f6ad89fe567a9/67969452469.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16091850c140f5---notijeneposamut.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/57abce8589b08f58ac5a8bf9ae9578a9/vamedudogaxatamuzi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6421c70c9---9426740035.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4b1f9a4fd1008e8391f472ae9cba99f6/zidojupikuwisixekabikedew.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lufixajasevo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bf942fd3---movesibapuvabinegokeku.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610761ad2e671---51489462661.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/87570815143.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20a0c05c1---lipaxezewapewazeleraz.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/74439552902.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160981bc6eec8f---55349123715.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/33503570425.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/pideji.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609133c98cce2---86411965479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hp+beep+code+3+long+3+shortPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 18228 bytes
SHA-256: 209d9f7f5a08724ec90f42fde7c5f2223f83843b566ab245d67c44dd6c969732