Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ed3ba168652887…

MALICIOUS

PDF

124.1 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: 5a159fb7c9fda6a9088f7895287b0950 SHA-1: 132cef925d1d7a0734b50bd9c92e138a87466228 SHA-256: 23ed3ba168652887f02b1bedb9f9991e37ca894bd1ed70a8d4d8ccdbce9511d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external URIs and links pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

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
font_03_sfnt_off0001ab97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB97 18308 bytes
SHA-256: 12afa79e3daa1b1553e56f17b6800e9512f4ecd219f920ae6ba097efb34a07c6

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