Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f6c61890c7dc0a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 05:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0b7076baf092e9124d909edc2268123f SHA-1: 948b8c944beb84c12d203158a5219d952919da36 SHA-256: f8f6c61890c7dc0a2c245b85eb0ebc4e24fb8727422f53af059c31f7af8e0bb5
156 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 0.9947

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://oniceh.ru/uplcv?utm_term=neft+form+icici+bank+pdf+download PDF link annotation
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/91126791024.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/leaj0oqg4mplo9isvl4oljfm15/bizuzofugobijana.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8278cb06b4f2d966a6ab8573ec7f63a3/5742973423.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81e91d141---jumibaxomet.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c919f4446f1---fegosupaxe.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/dokutitutabelobafo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffee99c132c---tejunenowalida.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/68150806377.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/jikeka.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lqtvdhdqq7nevgjsiucmh9tlt7/rafufevopinimipom.pdfIn PDF document text
    • https://grandstone-egypt.com/userfiles/file/3734308226.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/batudomewew.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/58858219617.pdfIn PDF document text
    • http://bdn10.cz/files/file/75975635315.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/jenudobozepak.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/51773893601.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sukinawu.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/gapareruxufuza.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/kuwumopitovokabijafof.pdfIn PDF document text
    • http://hncastlecable.com/d/files/6749916695.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9e5d1a51---roxiberigoduzireneporok.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/96818536469.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/juvevigir.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/88807337540.pdfIn PDF document text
    • https://mfdesign.hu/files/file/97851409566.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 18824 bytes
SHA-256: 48f3688205755769c9a18c832a12e4d5d6a4edcd50da6357c7103cfef68308d4
font_02_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 10908 bytes
SHA-256: 5520832611395f32ad764871dd40ceb8c3bde3db37d766eada816db92480b0ef

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