Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc796196edd96df6…

MALICIOUS

PDF

79.1 KB Created: 2021-10-11 05:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 941e722d8e087137c593557d61b1182c SHA-1: c72d83e34dac9516b50d3e23cc663c0e347a3070 SHA-256: fc796196edd96df6248eb9a805d01136a5c59d495a5018a011f8029c73642e37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No specific document body text was extracted, but the presence of a link farm and embedded scripts points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e27d5d2d44---68766048182.pdf In PDF document text
    • http://yetisirkaucuk.com/firma/files/lopejikixaw.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/11132436780.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/pasubipuluvamodisotudox.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/mimikure.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/71400183046.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/wobukuf.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/97911793332.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oabh7khp2qa1u45dqhjfn6vn2k/widimexosozagexenesaluvo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/godal.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20211011092005.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/wevawigonagilov.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/fevenitipazowoxilemevos.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/sugifulosekatezonuz.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/lawasiduwanalu.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/libotazedozusugosigix.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69950938162.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109230332265300.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sunjd7d9jgvc2qf2ju1rvtiip3/vamesamodozedadisamovawop.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/50143098102.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/96983891628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=practitioners+book+on+trade+finance+pdf+free+downloadPDF 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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 10932 bytes
SHA-256: 482b45f70a4084fa2faee64395781f7eb73b0a8360842af1e05672cc44228b48
font_01_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 18300 bytes
SHA-256: 24d202b87b61f759f01503840a9c9b571a2f8c60e0cf37f8c302cfcb6a86ed4f
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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