Malicious PDF — malware analysis report

Static analysis result for SHA-256 8943fd6216ab7075…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 12:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6adbbf665ba7191288c5d59b609901bb SHA-1: 796ff799e133dd4e2dc7e4d73a6c0e332f594d59 SHA-256: 8943fd6216ab7075c1ba779539e8dfeeb4bbab1bccb8ffeec23579f7c50e6902
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, with several pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://laplacedesstores.com/upload/file/tajobogidegidoloj.pdf In PDF document text
    • https://bouveau-consulting.com/userfiles/file/78108960718.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/98959941378.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/63002034516.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wabirezonibasuvives.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90121f100---kobadidalozab.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/nafawixuwidivipobag.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/50fajt28l62oqh969hd3b29a80/89974854220.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/26398569856.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/83881989744.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/xeponelojir.pdfIn PDF document text
    • http://precisao.org/files/files/60940462602.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbe2b770e---tizewadaga.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/61374143640.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/54532192430.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fifulaperaxuxubadaf.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/57729845843.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/32578667122.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pebuvobaziribebiruwobizo.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/29296343651.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210909_7FF94C6FA53AB734.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/rejimilamo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/puvesawafufebuxadopa.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/38341865157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mulla+transfer+of+property+act+book+pdfPDF 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_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 17584 bytes
SHA-256: a05e8a1ecfc0ac218ef2a65d8885d036e1f981406857ae866bd51d71b8586e01
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10960 bytes
SHA-256: d2aec4211f68aea692e7b724dafc2d1cacb86bc37cfb190b3ff5c19dc4bc44a3