Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73b961f87d83214…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 20:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f756316eeeab9029bf714da969ee1bd0 SHA-1: 798f7d523bc1b4bd17db2ffceeb6beae04b13ab2 SHA-256: e73b961f87d832142ba88c2d8d7d0f72faf3a5f87d5ab34a2d1e91d673aa6eec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file functions as a link farm, directing users to numerous external websites. Several of these links point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/wadumomojupewimuwugizemox.pdf In PDF document text
    • https://people11people.gr/uploads/File/95494010127.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/geini3dor113laides0vh86545/dizasid.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d407b45e571a37f8ec3d325a2ebf3a39/42239811355.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bc133893b---91388719863.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/40857596976.pdfIn PDF document text
    • http://orem.mn/uploads/files/54584510240.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/xipelodexudajemojujuger.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0d62ff863ba95be647e3a0fa678e65cc/vojulubetitip.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/89253565053.pdfIn PDF document text
    • http://posuni.com/userfiles/file/97806896114.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4a1de2280d16e2323180a28a720cea4c/rolozo.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/bokepevidatitukedazabatot.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/51989909684.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/90748763857.pdfIn PDF document text
    • http://midel.me/userfiles/file/64551196068.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb6376cc1---kisibeveripofas.pdfIn PDF document text
    • http://synergyproperty.com/images/files/15530595621.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/680402e89ff4ebd1b590428fe7a0f82e/25180298271.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jbqvkka1erkpktnas3e3gonf9m/38904373481.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daf0f031370---81608573473.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/nitabadipobemomavexug.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad4150db4---69262834181.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/80924584101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=weight+loss+diet+chart+in+marathi+pdfPDF 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_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 11060 bytes
SHA-256: 86be0503b8f9e406f000992b8b02ce7bc45cf950d56546f9bc34c7cb5ef14d85
font_02_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 17140 bytes
SHA-256: a49b09eff551978fc4a324cacea9dcd800f3c93d090ff66fb8f3264220684bdc