Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78ca93f4efb4706…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 06:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af9517d7306317a240892c1d0d7828b9 SHA-1: cabacbbad864dc909f411606a95551b61dd04bba SHA-256: e78ca93f4efb47062239d4163442558a5eb8b64656cfc108d7ac501a4571f75e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many links pointing to external sites, some hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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.
  • 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://cameragiaminh.com/upload/files/35056047514.pdf In PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/votilaki.pdfIn PDF document text
    • http://charontrade.hu/data/file/letufokuxifizanobip.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tufexukog.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/patunufeweseritom.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/17944373018.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/74535090016.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/demitipelegisoderajoj.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66102967889.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/gesanosemasatep.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2206d244217320ff55d505343f6fe5ad/nalotukinim.pdfIn PDF document text
    • https://fratellifurloni.it/file/wodetiva.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/siguw.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/50411554703.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/lodubodovotureg.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109112330514410.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/bifuvugi.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nenurodirexuwaji.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e40c1c7071---rokisuxakijutasekul.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe8e7a9c04c32d478dd0857d684b7419/wasemoxujezi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/76580671389.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zoweveginu.pdfIn PDF document text
    • http://rts-3.ru/upload/files/61094304927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spongebob+game+frenzy+mod+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 10916 bytes
SHA-256: 18d1757433e2502c18b25913db7221b2f92ebb647619f206fefadafcb84978ea
font_01_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 23548 bytes
SHA-256: 154791f63239536f475a7d571521a43f10e76334c28021294b00840654b9368a
font_02_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 16676 bytes
SHA-256: 953f8ed25126662d4bfdf154f3f6f56bdc81f109dd3cfe690973fcece3c107b3
font_03_sfnt_off00013217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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