Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21c45914a13af5c…

MALICIOUS

PDF

326.7 KB Created: 2021-06-23 09:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7736becca07d4104734537be04e5301d SHA-1: 4f08b24650fa1b906c60d91ff907fbebbeaa800a SHA-256: e21c45914a13af5c37c216a14a8e94ba07ac82df9d62835a38eab7678b6aed13
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9494

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://bjsprt.com/uploadfile/file/%5C/2021052102063412.pdf In PDF document text
    • http://fitviewer.de/files/file/38939438228.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160811d03a0c99---25010041120.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d94b7453---vadij.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/41319585220.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3b79f424---lizelunaw.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090542358aa6---28005728349.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/91545552281.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0582176b4---95431844501.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/jevexojukekakukeb.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ca1md3o4n1lb73pgkgohgjcdda/katesusu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09f71b6fc---wolobidorotovu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b9a37963---pivusijilotevati.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/30160e1acb5a40a050e0cbaa2ce95a6f/44199103683.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b7c4f613---36663844220.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961d054e5d3---kuluvewefiv.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/gaduwanomaxorajaniwez.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/cd625fbc6fa37163896377399d66fb65/76090625225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fyba+books+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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00048a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48A33 5168 bytes
SHA-256: 59c947cbda51bfb216d6e0bd5a3417cc7d14b6b8ce712847b52305559216c9a0
font_01_sfnt_off00049be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49BE7 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0004a748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A748 7520 bytes
SHA-256: 908534d9b928e837345d47e8a1199c9d51750a9d7900d73815bf4694695029e5
font_03_sfnt_off0004bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF8E 11312 bytes
SHA-256: 76db32f833dd11edbf9d973be00189c596eb0b25958f55b00418b491065be15b
font_04_sfnt_off0004e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E656 11228 bytes
SHA-256: 40fd07b1e59bb613ae17a8e30038e073a23eb5913690794a895db193a8013550