Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e53470d42957a4…

MALICIOUS

PDF

950.0 KB Created: 2021-06-21 17:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fb84fdbc92132862472955d5a0341036 SHA-1: 9c31dd37a49f5db1a1bdcc47f90faa35218ca347 SHA-256: f5e53470d42957a4ca59ed80d0ee0fb4ce84930ab07fd8ef5e732547380e2f22
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV, and heuristics indicate it contains links to compromised WordPress upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and linked content point towards a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.0641

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.
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m7f95o9dc5fbbfh5i10mt5bgg9/85790735822.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e16ce795---guminag.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be4816d81d8---wedudoka.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/14291433895.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d313b29e0c---daxopafawemelunav.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd4520560---70949366878.pdfIn PDF document text
    • http://arslanemlak.com/E/file/44932660682.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c9d9d168---35991110695.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24c7b1db9---38250591810.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/855992113fcb2c10d535a338cf035bea/37075265819.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/rivovirutibaxivof.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1abab9fa1---59029952146.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608077f3855fd---39676754926.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098af152f7cb---wavemolunogub.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3ec7ba958b4d012b93a8fda252d23e33/ruvifurixowegidoxig.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/40595992680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=oddish+pokemon+emeraldPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000e88b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B2 3660 bytes
SHA-256: 14f468eda5abc48461547a08e7bf9623cbe8a18a97a285e0268a6e69a5e01ca8
font_01_sfnt_off000e95cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95CC 5288 bytes
SHA-256: e25ef7c54788007e9795d083a184e151f7e459d2029d4dca9fc48c37d7ada565
font_02_sfnt_off000ea79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79F 14504 bytes
SHA-256: ea36e56745d2cfec02d95310b27ad9b569731b25d726cf80471fae3b34fdcdda

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