Malicious PDF — malware analysis report

Static analysis result for SHA-256 422d1b491349c054…

MALICIOUS

PDF

101.3 KB Created: 2021-07-29 23:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48ce468e219c581570b2d21973e47847 SHA-1: 5d874bcc326bbb2bd2ab722f61d87534187c401b SHA-256: 422d1b491349c054733e1b82d08ae4a0d243a91b7f2f25eb63e1f0c710f5befd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to initiate a fraudulent conversation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=why+do+iphone+chargers+stop+working+after+a+while PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/444outbmh86ql6oqg5eo0pf23j/33781772471.pdfIn PDF document text
    • http://geose.ru/userfiles/file/relejepanipa.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfdfc1626---gukabibi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072b352de5d8---misaribupanuvapu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jcrq5mli25b10524slj53pvku/69564022093.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/cp2heti7q9q41ef3d3qgq0kfoq/19361106506.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d89fd9127aa785cb4e6ff73cc2ef42a9/zomarejujeranu.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/65570571603.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/7h90b6r9odkpvmvg5v8p8c75sr/xifofetulixoja.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/66325682031.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rejewasuzarabop.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/82421634491.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fc2b800e---tupolonidaduwumagurop.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608486a2e6164---satanudiwesa.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e466373ced---74109593624.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d0d648ff81717ebf14f64f743aa9a333/folezemegitewotidewom.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/69081093816.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/25bf10fc65b70899f039f8196d30d065/maketufazusati.pdfIn PDF document text
    • http://3drm.bg/uploads/pictures/files/vatorik.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/rupakimozakevelixokujit.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a773e4cfa5b---jinozakadofabejena.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42f1e65810---36438457874.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/figosefizuram.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_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 18024 bytes
SHA-256: 95ee487b9938099a86bb98404ec46bba294f84e0087286d25dc3043f178dbd58
font_01_sfnt_off00015495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15495 11184 bytes
SHA-256: 358c56f21f2bc9292be1b16f021cfea2bdc82bf6f9ac69427df06531780ef1cb
font_02_sfnt_off00016e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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