Malicious PDF — malware analysis report

Static analysis result for SHA-256 620b3dccf7e3837b…

MALICIOUS

PDF

84.4 KB Created: 2021-07-30 23:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6a4a052d2d46899884778295f9d375f SHA-1: 97f6669c4887899521aac39f2b530afda09b5658 SHA-256: 620b3dccf7e3837b098bf1b8e5dea3ca38b6ccc8215fc286cf3f09fd9311b850
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. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in these scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://laborke.ru/uplcv?utm_term=vishnu+sahasranamam+meaning+in+hindi
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/711534b4ab3dccac19e22fa544dab75a/sofemovose.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/745c7df2dea50598c3de0d303410c549/93010648960.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210630_EAA5DB0BF5662929.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1c2d82e776c01f6c6b7e7b2b396359e1/21005977052.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06d16ae412---fikotabi.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fecdaf1d9ce7687960cc6964516d27ba/wofakodivido.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c03ec879cbb31722b28fa3976e42397c/zukuvinonal.pdf
    • http://babywagen24.de/userfiles/file/85598610881.pdf
    • http://tfh-filter.hu/_user/file/73233575580.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0972218135---nagibubepapuviven.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/demenijij.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099f151a1d3e---davabanis.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b590aa17d---mavarimejinofusuri.pdf
    • http://stlukesmn.org/clients/17773/File/nukevofirolegoma.pdf
    • http://www.pranabkumar.com/fckimages/file/53202602249.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f17cb09bf66---6900181302.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a2821071454---93728245717.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j55q0gpdbtac2kbcjl0i1ca4ep/kenanane.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/livamuzexazu.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b45706be473---51703513337.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb046ebb0---72376958922.pdf
    • http://wernitznigg.at/files/zavakeve.pdf
    • http://dent-pro.cz/pic/file/93600846466.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2nt0koejt6b7l3s3t8kmtd8amm/43783072772.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c870f85cff7c1b7ee5ab60b2bd72df1e/zanuwifofisudeza.pdf
    • http://highendschmiede.de/highendfiles/file/puluputem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e644.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16792 bytes
font_01_sfnt_off0000fe5b.bin
8be67f57c6637a2cab9f1de1731f8ec9e148851270f4d2fa02d06fadd011fe35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 10500 bytes
font_02_sfnt_off000115c6.bin
dde95687e8b56697abdc8099b649520ed065077cd4ee4384f0d90742b27bf16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 17624 bytes

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