Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78366d536116271…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 19:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c84547951006790a2f6ac7a2c2cc3c9 SHA-1: d05d02f5256b28a704c2c78897aaf925317abde5 SHA-256: c78366d536116271d482c9de3f4a15072857b72879011be54a6b132880dbc846
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dakdekkersindex.nl/images/uploads/5709244708.pdf In PDF document text
    • http://khachsansapa.vn/webroot/img/files/vamifope.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/vivonomamakefalajo.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/remumomeratumedipuxakenod.pdfIn PDF document text
    • https://computerzone.pk/file/47355841333.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/noriresufa.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/51551818621.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/fibenug.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6bdace35---2193243448.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/liromobukabubelitosema.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109060033497297.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/45393277906.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/30415565568.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/45867478986.pdfIn PDF document text
    • http://vuason.vn/upload/files/23017605504.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/xefitoleziwukudunokopapo.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/31196033761.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4efv77258jsqb37h6f4qb2bm0k/kerodaxuleve.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10403471231.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/40031083285.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387b2a108a4---81250474309.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/24119187433.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/61312611425.pdfIn PDF document text
    • http://c-six.it/userfiles/files/80976538150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=read+happily+ever+after+kiera+cass+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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 16932 bytes
SHA-256: f11d92bf1e5fe5090426fa02f5ae63a018620492769a2ea85bcd7d59437926aa
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 10812 bytes
SHA-256: a416022afb5564c770e566e2ae8366098a1d390ea3758da020c5551b8c097b31

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