Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c2f7edcc82cbee…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 324260dbd06e3827e5e134ea28c84142 SHA-1: af3871c3fb94263e5f7fba0b25c280a4a41469d6 SHA-256: 90c2f7edcc82cbeec9a66dae12c9eb4a6e5f3fe5783bc2d9953f3968ee552dd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics further supports the attack pattern of luring users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=pokemon+masters+ex+apk+download PDF link annotation
    • https://luathoanghuy.com/uploads/files/65268051970.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/64193876548.pdfIn PDF document text
    • http://maihome.hu/admin1/file/kobenijirukuze.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/25nvhf0ggro51dqkrm3qrl7045/61539115118.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/vopimexi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348cd3ecf20---kogelumasiken.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5748522949.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/suvetem.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/nopepixirasatinusawewub.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/67801157649.pdfIn PDF document text
    • https://aaaxxion.info/images/file/33053116560.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tuwovewo.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/dirugukafazanepetugawa.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/tabejexuwimowixutuki.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/47585616180.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907153711.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202196238261677.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/zinasabo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161356c7c063bd---rodumenogodibanejozoku.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/33692749804.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/83911651236.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/32489402116.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/48251707564.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/rumupaveguxivifomaxe.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/6657910235.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_off0000b777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB777 10740 bytes
SHA-256: d475333250102acc499e2107ef0abee6039db68dfc6ff70c60a6a3e8665548aa
font_01_sfnt_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 17508 bytes
SHA-256: 47b80e964e1219723a369696435e5058704c259a7d7d8e8749659b33c83eab57
font_02_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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