Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20e23aed1cfc975…

MALICIOUS

PDF

78.7 KB Created: 2021-08-17 21:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 45b6cd8248d78294d8e006782b9cc8ea SHA-1: 2dbaedfb6689a600f908844cc9c6f5ea27f8f6fd SHA-256: c20e23aed1cfc975f382867570814f313c369b4cc251f034f6029af5546c1f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9579

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.
  • 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://ovth.ch/userfiles/files/31001355217.pdf In PDF document text
    • http://korean-school.hu/hangul/userfiles/file/37589735047.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/66be006470f7ec2a70f936d5c34aee86/10381313891.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/silixewuzomarijebedado.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/45608254972.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cc0b7391d8f04b33dc3e8513708a8bab/filuxurumilamezovoz.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/kajoxatoko.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609993b3d5053---66496233236.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b35cdee65---siropom.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ed22e4b621565b6f70fa1303a989975b/92967144078.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/kedatonosevopej.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7e8343c0---92477305909.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/9545766116.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/sazez.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/19b8b08b1e2a32a2d6397d5ee122c519/93418486304.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gubozefelotituteritob.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/skd2klqkm1qc2nnnpp88hi8qe0/815435346.pdfIn PDF document text
    • http://kaies.cn/upfiles/210701235754181874jhpztr.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/lnprscuiu4ddot5engknt2l5uq/tidagi.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/26378756189.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b41b1126a84420458c18544b8cd80c58/rawofa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vigadilomusaduxiletune.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/tevazimiwofun.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f0057795efc---33140628419.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/walikakojari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=funcion+cubica+definicion+matematicaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 17304 bytes
SHA-256: bdad81b0a992e8aefd598add55d075b436e4bfb233839fa376de00fd5ac939f3
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 10540 bytes
SHA-256: fb4bcbb669241200936e7e2cfadb262254252a3bda018b4eae67bd4ca0d63366

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