Malicious PDF — malware analysis report

Static analysis result for SHA-256 221575c4a5f6ec83…

MALICIOUS

PDF

91.5 KB Created: 2021-08-22 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55234fa72dfc32b913edf9ba0fc3b204 SHA-1: 64a36f6a89b2e26898a038d4052d6db5c8cd620e SHA-256: 221575c4a5f6ec8367e233ea5cce58a284b160456be1d0c1223e165de7d27090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=what+time+do+uc+berkeley+transfer+decisions+come+out PDF link annotation
    • https://trimix.bg/UserFiles/File/71282072856.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/84295195444.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/27849210695.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/83695169058.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/pogoniwesomapazigip.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b779f3c4---51716216303.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c3cdd3d5---810649260.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/11900042234.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/lidoxasubujaxotetoru.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/pagexipadafobixum.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/lupidonazefaz.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0a7231736aa845d2290a9b9870d4eec6/tasos.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e72184f1f9be931dbbbf965c9f0a2607/razadomidukoxefo.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/33754488385.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/88684147218.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6856429c43---7341099877.pdfIn PDF document text
    • https://gulamanis.com/contents/files/64214904664.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/dagobazawupakunasavi.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wuxaxasulugogobitivakefak.pdfIn PDF document text
    • http://mosjob.ru/images/file/70851510311.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd3025e80---49750845660.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/fusozoxebodebez.pdfIn PDF document text
    • http://esejsc.com/upload/files/76834930726.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_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 11180 bytes
SHA-256: 2c41ecee2bec8476f49c0a56a2dc3156b3cce480c401efc9dd267c7d9e6b51b5
font_02_sfnt_off0001319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 17488 bytes
SHA-256: e19173f0b61a1bd7c0250b2fbe5c72be48f8640f8850cf153aa7d31edf689dff

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