Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aa23e9b772bb12…

MALICIOUS

PDF

116.0 KB Created: 2021-09-01 07:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4535239a74abcbb1b9584da1b74e82b SHA-1: 0d3a54ab2f6f806657c7b58b6b5ace3b139d851b SHA-256: b4aa23e9b772bb128ccef811d3b1bc99aa0d52a188490a43009f6fec582af4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=s+chand+physics+class+9+sound+solutions PDF link annotation
    • http://brmxn.com/userfiles/file/20210615225853_8nih2c.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fe6e1454---pevixakuzekunovelijabiz.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a3a53ccce45ada2bbbbe73011569d8db/retopipikujowokir.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bijisanomi.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/velud.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/fisasumijizuw.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/davilebitipefu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c629760e783---silixegazik.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/limoz.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a11871c41b4---sivuzufa.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/up61qf6qe9tk43h9somm8p5l99/norez.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/navomegimosujimux.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/3686e32108e065086dc66b592f90a71d/38069610219.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c992b256ed2---lifitidowo.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/bexub.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611dba96ce040---vagefejamuxizarinabi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/81350743785.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/35863765908.pdfIn PDF document text
    • http://i-dron.cz/data/file/19091859304.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f4d9d01d52a565665bedf68b5b2c9ded/zefibufanubotorova.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609040fcc3b8a---62812441857.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/petozovofit.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/91293199640.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_off00015ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDC 10836 bytes
SHA-256: 8574e7883240e2fd20cb662774e4ff7c197ab1fcf1331fce7d2acbdd6b4b8206
font_01_sfnt_off000176c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C9 19784 bytes
SHA-256: 46e2d206f594db70eb9a0389e907552c3f59d6e0888703d9b8943341a735905c
font_02_sfnt_off0001a9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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