Malicious PDF — malware analysis report

Static analysis result for SHA-256 167ad1892609fa4f…

MALICIOUS

PDF

94.7 KB Created: 2021-09-01 02:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55f6ced58a514d1125994330cd28487d SHA-1: a29017a2398ac069a2543add823a9d76bd3a1861 SHA-256: 167ad1892609fa4f473a2625910b827fc0cef10aff7086c39fd468c21f6c1fab
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/399487deab313095cfea254503ca0833/28696585146.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612beb8ae9c68---98845228556.pdfIn PDF document text
    • https://flomogroup.com/upload/files/25102759441.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612938c3eaa7a---20396583976.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/sesovidivewetesoxenazuga.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/gisikoxawedob.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xetaxafawegulopujo.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/sidobiriwerusaxerusamu.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/43510026255.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070502274242.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160833282dc46d---xezawugidisadivawemedi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64f1be896a---85393851976.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hho62ep8rmofhohtnn3fjn84o6/11234527258.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/85d9bae0a4a96ecbf6588f0906aafe1c/76679801189.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/21125994589.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/76126913824.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108092027394028.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/fupizevuzuzizuleraviwisek.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d531ec714ae---51486865922.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3njbocil033962ph70grse2ue3/60569108197.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/jatosawuxegivikopanolera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+way+out+trophy+listPDF 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_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 17600 bytes
SHA-256: 53616f90a971e20d5b15f94cd5a82d1d538e63d27408c83e3610c41b1ceac5ed
font_01_sfnt_off00013cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD3 10392 bytes
SHA-256: c66aa8fa6792aa62b8f9fd7c01a2517581779b77310ce9c6442afcd00c7c1150
font_02_sfnt_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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