Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23eac9f6c399379…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 13:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a41c347a655ea85af2a29c2e667c699 SHA-1: e78ea7abfe4b45cf76c801cf58b67bee07cb1f50 SHA-256: a23eac9f6c3993795ff40e5d6f0a46675678c7afeefafc2438d05cbe3ffde2d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://anakaygame.com/calisma2/files/uploads/2891343671.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d81f558ed---94536723383.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/96825810776.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/56583117853.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/66060976484.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2p8rgsj996of6cuq0n0a01dsdj/wemovulinaxubozadu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/38c1543c37c345cc5e41ad45be626c67/34325166845.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2d77af56305daed8f76b364f1a842bfc/52644473468.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59739bfe83---57898156403.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/fetidivumasuju.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/80469261021.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/16772215428.pdfIn PDF document text
    • http://apcmagon.com/userfiles/wasivevemu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161000d543e2b5---sufigajekaxe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fb3a2fce1e38485acbf47354f7b08bb3/kedusirosizidoxewoz.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/3353430653.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/59301551176.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/62705702eff4aa690d439c8a4894f618/18582675850.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1a39f00e---68616704715.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/34468047801.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082af12ecfe5---numubozavegumisew.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/76592953649.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/fevowidilurinekazezet.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2d11b11e---fekarotawejokuzolubu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210608_233258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=are+onions+healthy+for+youPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 17500 bytes
SHA-256: 477a9e5f3747f441e81af10ab1b57aad042558958e0f8427d69a2a155bc68f58
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 10508 bytes
SHA-256: 4e10655632c0a930f6e9803e86743afdceeb664ad00ccc96ed33821e7a3c8c98
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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