Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c75bdfc72d2f61…

MALICIOUS

PDF

86.6 KB Created: 2021-07-30 06:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5cdebdf3d156ac14c560a86c6daee187 SHA-1: a6517f692c0ea4e25529f4a4608719499dff0513 SHA-256: 81c75bdfc72d2f616f046760076738c14e6bbd08bd2dcb1c44b8b9d73bbb2b06
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The presence of a 'Fake CAPTCHA' heuristic strongly suggests a lure to trick users into clicking malicious links or performing actions that lead to further compromise. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=phoolon+ka+taron+ka+sabka+kehna+hai+new+version+song+download PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/646fo8sl6b6s8hmfgall75i6n7/fakukiko.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095500834afe---42437247061.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/17781d612661336e7b170cc7caa54ad0/10547452487.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/4498506064.pdfIn PDF document text
    • https://fishboat.hr/files/5664477983.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1v28bp41aja2frbugsdb4td58q/xedefomid.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/04511a5506c3b612feab3d5e17180fc4/30466788548.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/42018491570.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/51877821027.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/namiborenapiwulakomub.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/40194982652.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/wegumebititalonovazera.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/48c11442cea2b31712dfa7fdb1b3f071/69004799801.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/wulurozabetiworukadevazur.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/53577895234.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/29364621474.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1i5mmrlnem5r8lhubsv2o52v15/39665235455.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098324116282---jipejateleju.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/10628439963.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/75822184992.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 17300 bytes
SHA-256: 25dd0e924ab8b51fd947970663fc2baaef4783940a0c8678bf59b51499e83004
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 10912 bytes
SHA-256: 02d458757fe63cf9596c36858431d389cd9b01828fc9bfc37075c22f10ced769
font_03_sfnt_off00013608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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