Malicious PDF — malware analysis report

Static analysis result for SHA-256 e000c5bd0b0479d3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 22:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 623f00cbe4848f47ae4b6e255b50e5db SHA-1: 3b36cef02a43307f39b2f1c2b4fa3315a453c564 SHA-256: e000c5bd0b0479d334a8550d72c0a4cff4bc7284638cd6df3c50a7fbc3718d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used as part of a phishing or redirection scheme. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • 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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/a271d1f5bbfc108d389ed953622ea7b4/78691095844.pdf In PDF document text
    • http://parkwaywest1974.com/clients/861606/File/88090305890.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/37432224535.pdfIn PDF document text
    • http://wenxuezj.com/images/File/97388640172.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zaxuz.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nemiru.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/46392191708.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/futirimarokemuvujozasiwe.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/53822890714.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/46940684971.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xogonuganon.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dccf51d26---70285256792.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/podujelekunesixezinituku.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/102925673ee395e74babdecb3423f66a/kugalesagufejebovawebix.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/61033957316.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4f9efd5a92574a6ed1c81a672f3ce2c9/40778389289.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/29178294155.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/57472050588.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736bb9c917e---pupujepezerilugud.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/zabomopobazovu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/kagajaxegiletosereredo.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/wuloxupigat.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/93930129977.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6195c9dd2---mizitevopivarut.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa34d78b3---18391200228.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160fea4197a76b---28544545084.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a516949fc---27140343789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=most+welcome+meaningPDF 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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 18492 bytes
SHA-256: 48a52fb7049e41980eb9b0a6262cdd4ecf90652a8a7d6937d78d0b29b2bd67f7
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 10552 bytes
SHA-256: 99b317c47a0f3d6558a4ee9fd92e192d3fd39d7b436bfc1fdccb20a7d581ebf1

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