Malicious PDF — malware analysis report

Static analysis result for SHA-256 f723b36800002c0a…

MALICIOUS

PDF

93.7 KB Created: 2021-09-12 23:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9567ee264a5b5f59e514d4a977dc2bec SHA-1: 52d5f792b956d50697e6f301a30e954e62a8c76c SHA-256: f723b36800002c0a6d825600de016c3089efeba1f773ca2344cf85b1a832ded9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this, as these are common tactics for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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=the+speckled+band+pdf PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9b6a159f3b3c85e2ed7db0d7d5087dbf/nevex.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mv91s2c9gvn2g9muakhke06ma4/nawiludizijedadutos.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/46936614251.pdfIn PDF document text
    • http://happy-land.hu/editor_up/31805159297.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a7f7afd49f08cd798b347857975c3d12/woxowizofax.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd57a5e8e---49650545662.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338e1b5f3a---45900066031.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gifovanaburitosuv.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/dikokuketilevevebifivu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d49e6d0a---84105319991.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///92826710498.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/32281231387.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/69922580933.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/tujisepumidef.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/16113069650.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/59665176480.pdfIn PDF document text
    • http://rld-carbon.ru/file/tusiwetivo.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/59110303567.pdfIn PDF document text
    • http://vning.net/filespath/files/20210904104928.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f411fa01aaebec7397e773c1079cb1f3/juzitakewogililoz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e447cad09984a59222e4f51ef6712b7b/92328010564.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/zunelezukizakan.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/56323147836.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/9655709740.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/gekitozexela.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/rojikixutofonewa.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/34645718638.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/76p4qso8tvthmd91u1q5lagtf0/guwovutebamimi.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_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 10500 bytes
SHA-256: 37e628816f068b39f55c0a2897d85b8bf397ee5b59a191559f2c6b91fbb89d0b
font_01_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 18808 bytes
SHA-256: d47825a06526391e2086ff81c6897b2f3f5d5a334c3ee40d61fbe8fe3b518c7e
font_02_sfnt_off000150c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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