Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f1d5b63f0fd5aa…

MALICIOUS

PDF

85.9 KB Created: 2021-06-14 03:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 65378aa9fc7aa1028c34534e780003b0 SHA-1: 157e5e671ca76dff87f6152d557ad2b8e7d52c18 SHA-256: 82f1d5b63f0fd5aa75e79cd8922b3cdc01aaa8c328d59ad98c989820c8d5c8b7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8561

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=albums+of+2018 PDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f7ec720df148b8aa0bace0e2be6be4b5/63348688674.pdfIn PDF document text
    • http://berbun.com/user_img/file/53457585250.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mtm6bj7gn1fg4q95jcdn1cg5j3/zarepolipoxebagaja.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file/%5C/pazigivarugekuxerut.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2185d1f21---fimamezulivamut.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c9200151---noxexenidaliduwo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e263fef2---8325642512.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77920538056.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/joduro.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac85c5009---dinibixuxovosonifu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6np87jgmrapj41uvgdi36kqrp4/36347024008.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/bupuraruporedab.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/t6gr1qcsje1jb2uq6c0kj1ftlq/jekesot.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608409a9cd632---96940359562.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbf259830---5029011086.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3645182b1---nidagasazusuzenafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 4788 bytes
SHA-256: 6f9901dcea8d1a99435b4bde58ad80f3bbfcb931ee7c84abddfeee7e2e771d84
font_01_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 11828 bytes
SHA-256: 76de7d5597da2431bf8a1776d3426d862935a1a77462e4632cd19b416c8e031b
font_02_sfnt_off00014908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14908 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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