Malicious PDF — malware analysis report

Static analysis result for SHA-256 7093e4038c19c699…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 20:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64499d2c881c50e1917c0faa876a54e4 SHA-1: a2a3a3292f27bf8dfb961b7911e1a2059b6017a2 SHA-256: 7093e4038c19c6999512112901a5c3bef202b0c213a8fb609e1610079402c90d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://accuratesearch.com/userfiles/file/80712368627.pdf In PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/xabufoxupovumefunax.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/57173807681.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/vugakugegemuxes.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9e46e9f67874f43415bf0361c184fe45/pemodejigisuluwazoga.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea2ff2358d---94341396437.pdfIn PDF document text
    • http://parateam.cz/file/xevikixusuxevuzonedabuwek.pdfIn PDF document text
    • http://modern-pro.ru/files/file/gowunovituf.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mofepoxusat.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/33531958629.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xikebora.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/gemixuwotetudopetuwu.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/76549295486.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hjdrprimvdoac64e5361gegngh/4451864693.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/sisurisifovodaruf.pdfIn PDF document text
    • http://cmtsport.com/pliki/11758516007.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/65780977562.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/71887031789.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/80283135581.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/37975819511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+play+pokerstars+on+androidPDF 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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10668 bytes
SHA-256: a1d5306db25d5cbddcb7514a12941467940f278d2d083f56091c7fae7613881a
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 19624 bytes
SHA-256: 29e7673ee1b78a7905e98ff2b4fc665866249ee39302a21c082ff950096eaa51
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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