Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdc376dcc5f7ae0…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 03:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa986ff0019c7fbd5017b1f8b7c16957 SHA-1: 8a4a67628291adce840e8150ae8e16d21a9a1aba SHA-256: 5fdc376dcc5f7ae08a62f1930741590d025e1b0224e2964e6a420ad100c72b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including those using CMS upload vulnerabilities. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to lure users to external resources, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://jinanxintiandi.com/userfiles/files/66845151065.pdf In PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/bemekanejotulebamiri.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079864c9e9bc---sosejawovitezoled.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/62029665216.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0b0f911734aa5f939a764ec9d12c17e0/22668488091.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ea7d3810---41206368542.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wekixedevujasix.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27af9096c---77779326509.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16096be73b37b4---jawifesutunuso.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4c37bab9---kazijojifurimoxuzufujuvu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/rodobamelojonalabizuline.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mimakuwiguranabiwuji.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/26ccc6a2bd9a59816bd0f3cf7b99c3f6/86085861812.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m2kgcts3c5mhf1o75p0bdffrfe/zoxomidovenojorewita.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c35a097afbc2020193f8a1595bcbc08b/26057514637.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/39051079857.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609509567e48e---25694120450.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ecq58fj8n3qa14si32461i4plh/rujizuwupaxo.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/30577708868.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/3780595541.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a315b072---41195894003.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/637fde8dbe42e9fef348ccc17e1647d4/fosefipavixirikadavizu.pdfIn PDF document text
    • https://altbuket.ru/files/11855826856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apk+fifa+19+androidPDF link annotation
    • 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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10340 bytes
SHA-256: b7c6869dbf6a67a09a4857145d44f42bb4cc733075a4a54ed27dd9cc23ae75d7
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 17780 bytes
SHA-256: 27853798992e4e8cb1ec72c58b7b7e519c343b74f372f1bb995d491b3c7597a1
font_02_sfnt_off00013764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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