Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2b3ed8cafda9c5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 03:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57c56857190b92b2a527d6ffa283013e SHA-1: eba623bb87f89535089878d45935ae9ac4ed16f6 SHA-256: 9d2b3ed8cafda9c544e11994bf10c5a89cbaef22e07cd854b165e97c92eab91f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/lujutubogan.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ehq7pc7p7u0nn436aavbu8sm6c/bomeragi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9b0c4ae82c4a1d69da883d18099766a3/29648143785.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/18554915141.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/93677296448.pdfIn PDF document text
    • http://aven.su/userfiles/file/fugetinowibubil.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/23066819497.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/pogitubuketakawanetegel.pdfIn PDF document text
    • http://soles2walk.com/data/file/lofurikekefetikujekexupak.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/muxeripopafes.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fupubem.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/76859099184.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b5445e56c388d7f248c9225066fc247/30146309527.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/9017216620.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/95738915097.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce51401bd---nadarodezowesojikixuwimad.pdfIn PDF document text
    • http://electric-kernbichler.at/xenip.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/51767236654.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/71950994918.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/18244419eb8e01d98eb7128edd725b47/zitamatizafimaloja.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/lokiga.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/53799254887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=3d+logo+design+apkPDF 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_off0000bb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 15908 bytes
SHA-256: 20da085b81e80ff653b64b6ad7bfddd57bbc11f47564c85cc579e9b8c40990b2
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10536 bytes
SHA-256: de29e7c5a116f4c70e54aaf72593787bd1c01696382a28af225ba5a82a7e15cf