Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ca7e0ca70776e7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 06:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 529aa2cd0d1b168bb9e19644f7cf7361 SHA-1: c044d4a5274a162cb495e8973a716a709b79aca1 SHA-256: f5ca7e0ca70776e761d2d45a85dc4d754384b934c1dced542fcd9783b3446d63
154 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and heuristics strongly suggest exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8158

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://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacca191e89---laxesaz.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/gopulosusukibamer.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061600145580554.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/92630098540.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/da4c20f2d787901e7c6ac0f7bef6e9b2/sekipobolegobagububis.pdfIn PDF document text
    • http://billsky.ee/files/file/23714907522.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/famusutoru.pdfIn PDF document text
    • http://apothepharma.com/upload/files/karilezejevam.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d092698a51---gekefofekotoxajoxawelales.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/94488701586.pdfIn PDF document text
    • http://rurisnet.org/images/file/zobiwijanafegiditatuj.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/dexubalazilus.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109012217036693.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a57380c92871970f0cb3ec61c9f8127b/bizik.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae48e907a---ropejebolabitaj.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/laxowonuxigeram.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/93515799381.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/nonapawol.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/27321004076.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16643524208.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0327bcfe---jetididesape.pdfIn PDF document text
    • http://imaginove.eu/data/Files/82914696189.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976349aa4dd---xofosogarozapozoworax.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/978c6e00b5f9d60fe64eb80ca1c0adf3/27151061707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ftc+skystone+manual+1PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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