Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa613bea711dc84…

MALICIOUS

PDF

112.0 KB Created: 2021-06-29 10:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f601780b3b4b54f8564c77f03d52ec9 SHA-1: 09e5631eb6fd95ad7d141a2fdaffd610da493de2 SHA-256: 5fa613bea711dc8481e23e1a2dfd930d94cf7586169c770f44dff12c30fa0d0e
124 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution pages. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4723

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://catamma.ru/uplcv?utm_term=how+to+tame+a+stegosaurus+in+ark PDF link annotation
    • https://ckmandarin.com/uploads/96910585941.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836fc25a00a---diveka.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/sigawujumakejunubuganomu.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/ganazibenuzuketutuluvi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429044415193908.pdfIn PDF document text
    • http://brlairport.com/images/file/81753342830.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0f63995c---gagixipejunukalogawod.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789349285e8---binapesapi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607578847241d---62898509443.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d6970ab4f5272068247209136e3d4bbd/15063911485.pdfIn PDF document text
    • https://makenie.com/upload/files/5861223967.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e4c1d60e---jajudafisolot.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2cff2797a86b3fc59755e278708b07fd/58885735377.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/kudug.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b98384c601294ad9eaaee1d3175a51df/sivuxojafenuxobebapibug.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/18049418531.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/14259663364.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca784ccafc---58905322500.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/xetaxigesuxunaditemefipug.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/28517453383.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886dc1d259e---48450506396.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/lunofodo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a9aac9f6f61a90a03346ad95dcd15630/43812660316.pdfIn PDF document text
    • 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_off000148c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000160d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D4 18872 bytes
SHA-256: 59657015f691aff0ad8c123d6a1903f0191ed10b0f2bb28aed5be35024aa20d3
font_02_sfnt_off00019319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19319 10676 bytes
SHA-256: cb525399707ad834f0a01c868ee179929fbd5cc3675f12cffdbd750cc0fbe14f