Malicious PDF — malware analysis report

Static analysis result for SHA-256 048503d3734c2acb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 10:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a17019b7a3937ed631b763ed8526717 SHA-1: 8e0b4d01a15fbf9f1762ab7f9c7904e2574ed228 SHA-256: 048503d3734c2acb49f55252bc4b3cfa1f057607ebfa39f27344b7f8e337076e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads. These links appear to form a link farm designed to redirect users to download pages, likely for malicious software, as indicated by the ClamAV detection and ML classifier. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=download+kinemaster+pro+for+windows+10 PDF link annotation
    • https://asthasupermarket.com/userfiles/file/5868976838.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1946268026.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/58144827800.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/jujigekegesobujamozob.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/puvepege.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e7929b8359acb1723e7edfc0eecbebf/95985108360.pdfIn PDF document text
    • http://labsshop.com/d/files/dogekopizamukidomaj.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/wugodowisarefewude.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/zejeleni.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wigepekeduse.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/kuvidiladeneminuzosakafe.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/47160770345.pdfIn PDF document text
    • http://lovesenergy.nl/file/68391055845.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/44310138007.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/xifiwavavunolumudove.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/30673080276.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/nupufaloda.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/911676295.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021917655561848.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cdbd8a19b---gabejoji.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/49385540882.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b440053d6---32947669944.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16312426935YgA.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/sasobusarojad.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_off0000b86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 11012 bytes
SHA-256: 7ab7faa41b99e55a46473e7d20ae22555539568b2662caec6597138a02e94978
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 15036 bytes
SHA-256: 5340e267a400d3cd50d6c388af04530fde6e4aa97393b8f48bf06f23884cc484

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