Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86cba8dff074ee1…

MALICIOUS

PDF

67.9 KB Created: 2021-08-15 14:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ae80dd85a46ff8b5f51313a40f104fc8 SHA-1: 81e96bad723690529ebf2f7252c39f8f4c0d0ca9 SHA-256: f86cba8dff074ee11498bfd7d63951c27745ed5896aafe49c74f4557ddbd2804
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

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 https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b8f6f390500ace0167b58ba6d5ad9d44/3151261111.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51cc8635de---zagife.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/2e4084dd5de46677e9795ae95f27391f/mibovebitu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/98496321654.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/48771922105.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/gokawowugimekejilewevido.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/37216050763.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44452b2d05---rinovatanariwu.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/gikakakunef.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/sifidagofovofizoza.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2rgdh0pe7d5uhik1r13rhpfdp7/2907948838.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/vojudipija.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/meligisonid.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/jobajotutivata.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/pesurojorudubiso.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24bd6134a---73114280052.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10189000032.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce488c2d72---volasudureguturotuxi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/45786643968.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dae918682---82994803976.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/2143139470.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/868857b0a9d61c6ed0980770236074b7/12899385777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kinds+of+adjectives+worksheets+for+grade+5+with+answersPDF 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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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