Malicious PDF — malware analysis report

Static analysis result for SHA-256 3def00976fff08d9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 12:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b23acc33fdf18899820c3c362d2267c SHA-1: 005e408ad0c471a7c17aabad62bee4445544da3e SHA-256: 3def00976fff08d9ffb0a5e7fee1a6fd6c5a6ae022bcb187fb7814ac896f03a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=www+mp4+to+mp3+free+converter PDF link annotation
    • http://csc-vietnam.vn/uploads/userfiles/file/kinuwapesinagokelo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7791b91d9---77331901856.pdfIn PDF document text
    • http://actinq.nl/upload/file/potonurasetu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921045102836.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f394c89c9c---45442166051.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/bawemimonuvo.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vawekitit.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631181363.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/33896493997.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/71004134347.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/vavexoxive.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/99071795854.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebojumajapakusabulogufa.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/52887967639.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/lawebom.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b8739924---19992477306.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-6/20210906032401363429.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/tumor.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/460d6a54140f0cc2825964daf502ac34/47680876848.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210904163073115883.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1818b744e98050362fb2491ff0b64c9f/14958616612.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jewawakofapala.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilelejuwotosip.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fd57f58---susigaxobanejirikumumeza.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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 10568 bytes
SHA-256: 39650d2e09857a47f3cebdc721b04bffd130344bd660740c73c7f4b3d29f67e8
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 18216 bytes
SHA-256: d38221f1552b5f326de85802c975583121338905a65d462cd7ae7de825a37a97
font_02_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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