Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cfb6f45df0213a…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 13:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 533cd86ff7b33971841cf109cca6d45f SHA-1: 74c3a1caef3e3aa53d4654290cbd0871c36f8442 SHA-256: f7cfb6f45df0213af6e945d97f9fcebf46a56d65e11e285abc6407f13c68dd54
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 0.9977

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://coretry.ru/uplcv?utm_term=arsene+lupin+libro+pdf+francais PDF link annotation
    • http://keitbg.com/images/files/monomudepadaven.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608382ecb8484---pituriritimogatapikulage.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/55963866186.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1cf9599e1d---dezezetafima.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/56176827642.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/9088883469.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/66bee88bcb10c1f91176b6f523f1c3e4/golifur.pdfIn PDF document text
    • http://zimmerei-possert.at/tositinadowowikogeli.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/93847359919.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4bba3f2b---mazuvido.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/df339f7cd8f46d9f71ba06848c2fe995/99261336433.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/bufakofutopetesa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada98519a24---kosenebogasisanojuser.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/xutezufaredo.pdfIn PDF document text
    • http://nova-auto.com/upload/gumonakupolixaweli.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/57500561015.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6u620h7s6152gdkhkuo2d2dp9l/wifimeroz.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c261f2aca---70417206098.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/39778028098.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ef43131bffc89e97b74e1d208c935bfe/roviwidusuxeti.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fc4a33ca---78774966759.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/turux.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/44530761393.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/gefudojaluwune.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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 10736 bytes
SHA-256: 12de9bd60eab3bba3ee4140d1f4f13265f72829e8bcfb1b3eccf28b7b8c88515
font_01_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 20420 bytes
SHA-256: c751ecf7888175ac507966690351387091fc89574dc24deb6e4dd8a929ccdf8f
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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