Malicious PDF — malware analysis report

Static analysis result for SHA-256 217bde1bafb4deac…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 01:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 261c41a1ee55f95bffcd92947599b552 SHA-1: 6f2bafa3867786ed2141123d997f9f07e8121baf SHA-256: 217bde1bafb4deaccea5f6d66008cd2d0c7e05ceabae6a7ff65f5fd44842fb52
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=google+play+for+android+app PDF link annotation
    • http://interroadholland.nl/userfiles/file/78029598185.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a3517875---vikumexofezemere.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d18fa03---wozomilifepuvamobelenifug.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zutarobunolelimi.pdfIn PDF document text
    • https://costarica4d.com/contents/files/29696808131.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cff1ee4c336f1c9e315a0ffd0847cebd/15883758081.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/47651340584.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/56546642312.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tumasavudodareliwujapa.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/12783439926.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/31750897945.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210914181723.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/vovegezujugepedifib.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/19267786136.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5hnqk0bgapqt8q5uki21sdp8i0/58184094764.pdfIn PDF document text
    • https://fultoys.com/userfiles/32603680380.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/fozinekasapukovowul.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vuviti.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/50889607892.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/gabarefawemobi.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631146478.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/18658141438.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/16251556647.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ccd0721ece0658d09ef1724fa4bd3c82/97250857618.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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 17808 bytes
SHA-256: 68bbf12f9553ab2b437561b8878fef46f468a360820e8ff04a18a61a393cb957
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 10560 bytes
SHA-256: c9383a6f3c66c7bf594094d5d951e26237bd793d6fe4821ff18db0a2db1b0869

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