Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd13f105ca19121f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 05:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87914331af3827d562ce3e38b28d79ac SHA-1: 245001a1f436ee9855f17261c2b86ab0cdf99d17 SHA-256: cd13f105ca19121ff271ff74974e9e4ccef6ca16db8528dffd0dde021c0666d7
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads. The PDF structure and embedded links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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
  • 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://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/36380220307.pdf In PDF document text
    • https://sport-jicin.cz/dokumenty/xusuborimimowerowabutof.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/57566466059.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/689833c78c181c50995ebfcef3dbf7e3/remapinojimaf.pdfIn PDF document text
    • http://asja.ua/userfiles/file/32115413646.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/kixezodezapalifena.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kozitobuxebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3568cd6b6a---pafomineledeka.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8e8a36590---53526114047.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/93989867590.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/80958f2d58b2f7cbe29ad666eba1b3ec/dites.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c580e02d4c6---65954876334.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gixiwoso.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f616bd45d0---vavofanulitokifigulu.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/32581504733.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/6efot6fp3ehc0ovpuoijfpptne/3350419124.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7q84626rejm61ssf2kq38uutm0/muzemelotadutexilabab.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108230428572818.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/17372719442.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f10b804808389016bb1b78e7cb69aaaa/kidivorixebej.pdfIn PDF document text
    • http://vce34.ru/attachments/file/migowekomofunideval.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b9d627e8614009b4280d881b1aca289b/43199148450.pdfIn PDF document text
    • https://aedwea.com/upload/foto/badepijovuwabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=descargar+himnario+celebremos+su+gloria+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 11212 bytes
SHA-256: c86b9eb1df55a2f69273cbf112f0934922c6cf964b0e19ca1cd8545f25e7f8be
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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