Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a3286b20a5d7e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 01:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0ba4104e8de8d158b53ebf2511dca48 SHA-1: 6913bb7d9e5c825415d80cbddaa4d2aee924d25e SHA-256: 651a3286b20a5d7e6c6b4b5f4aa1dcde96e036befb015a3b229420686b52a215
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this malicious workflow. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=jeavons+j125+manual PDF link annotation
    • http://chandravanshi.com/userfiles/file/70662830489.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ff7470ee58cec610e499c20d62564abb/65738809361.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c88424916---zijimazunuzobifefudukop.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/biniwuzutibilonet.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/70697937602.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/robaxozabovopejege.pdfIn PDF document text
    • https://renault-service.com/userfiles/mogavunufukot.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/fijikezadapadererit.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/rozeluvogopitikevuwawekes.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2de4797a4---11693763300.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0c4813de---vujururi.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dawiperajixilidomegixeka.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3ebcc20a---37631863274.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/58297126636.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/betovunotegibikegosani.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/85223445682.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/9818880834.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/21845564941.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ed4ee40be---rezubezedivifizonu.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_off0000d352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 18540 bytes
SHA-256: 4fbbd342b9ed40760b40633ca17a98f3ff487419782cc1d971fd923ca2911a65
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 10572 bytes
SHA-256: 5b97bd1950bfb03e7edc2ef61ff68efc76e50c16221b292980ca77f6a1ffe12d

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