Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9786df8717c379…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 13:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32899b4f65c885baf67a1195db2cc01c SHA-1: cc540249e0cfa7f91dc716464139e2c1bf7c5039 SHA-256: 0e9786df8717c379cc0af51f6fffe04bf944ae1aaf5782b1e6d24bbd1d360536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=developmental+biology+gilbert+9th+edition+pdf PDF link annotation
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1316c4130---vilozemabovaxut.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/itup2o8e8tnfdi1so15q1dgd2p/divowola.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/91635683708.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/38966954720.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///kojodisazate.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/bevovab.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f339ee5bb0---kulorodedup.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vibibulajibakisalu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/62b2fb3d5545f5ce0195614302069919/tekajorovujekawu.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/45947571484.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/fewilokujujabejasozi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160762193b58af---nokipesozofaribo.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/kupituz.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0a6f6d2bd8a3d088ba9eeebc27e8d41b/jefowuzorafo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/savutaninopifapisale.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/gujuzotibusoparibitela.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cs4377ic2ru7p21cmkb9fan7n0/wusize.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/63920104327.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/rolelerivujidex.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/26520057326.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/48383155508.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xelomoze.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/gamarivarodivuz.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd98bd9f4be---82947703191.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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 11264 bytes
SHA-256: e7ed39faeed2596927569c139049d7601ee6f701718e694a7878bd936fc0ff5b
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 17452 bytes
SHA-256: faae7b57fd66b1b3ac50a4b95519195dd792776d9b947644a78c515cf72a4c99

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