Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0c043c4a7caca7…

MALICIOUS

PDF

76.3 KB Created: 2021-08-30 10:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18bd9c63db97847bdb147fd0e39466ca SHA-1: 1249a11f40e51eb3019a3b78488eedc2e8737cff SHA-256: 9f0c043c4a7caca70252b0420bec1ac5eb016ba475d511e4d6bc00122c89e32c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS upload storage. The PDF structure and the presence of many distinct hosts suggest an attempt to distribute malicious content or conduct phishing by leveraging these compromised sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

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.
  • 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
  • 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://teakdeck.pl/files/file/60596927031.pdf In PDF document text
    • http://szentdorottyapatika.hu/files/fepusi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd53043ba---80198862472.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wusugofepogexibu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/54a6f0cb17b8a6fd8670afe86b75a150/34846684917.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a68308756be862b98ae24969db137287/tomixivejurazajetegorub.pdfIn PDF document text
    • http://nensi.si/upload/file/36544183039.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943071039d3---josumokegudazem.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/26451583143.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720148197fe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd11641b4---jamipabumako.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4858fbf31f042d512440b72a6868dcaa/fuviditurazidamafalemipif.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fabg6jn58c4cfkqnbsr0jgkdiq/38519615.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/jixetipigujubadofe.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/iat3dack38crqm3je71f1v95fi/rekewuvonoxo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2ef5e38a1d533a9145d1aa4d226a6c50/vizarobolaxofajopogilujag.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/24c165212223afee6fabb2866f49d5a2/fonejesa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c8e3c065---zubuxexofikivojizeg.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756c34caf0---tapafi.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/melivakokubewux.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c7072bc90f21e162e3517a5e9267990e/jedulobuw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8128ce6f---63215029134.pdfIn PDF document text
    • http://nenorm.com/files/files/figutuzisiloxidobuk.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/63830740000.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0e6f39d7fcd3c456bf4394f53c6fea1/20622380490.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cq1po6uhplmb8dn53lkkrcuh85/68551388422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=top+notch+studentPDF 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_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 10272 bytes
SHA-256: 28867cfd4dc16259c3511d8b78af88840606b08a7e187860c09d94c0aa663c49
font_02_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 18940 bytes
SHA-256: 2da70a34aa9e7adbae4296ef54f5da05c3770705dcf92e60a0b81cdd13aa0fb8

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