Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1c8b8102a4b25…

MALICIOUS

PDF

88.9 KB Created: 2021-09-10 03:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ef313da4965b0a5fa66c73662480d0d SHA-1: 75c6e1de60164b26c1a83aaca23dce9502faa63d SHA-256: 19a1c8b8102a4b254e3c32943b041c1fee31d6eacd6dfd06b1a39395fb66f206
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://4bx.pl/public/file/wuforiliwiwudoj.pdf In PDF document text
    • http://ventilatoryzlin.cz/images/file/8899135299.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/kugulafiwalujudalotagumu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/76863859249.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/jedat.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/93294103657.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/53043963434.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wubelajomedofibugawufux.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/febofaxadekitasu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/xunamoxov.pdfIn PDF document text
    • http://1careglobal.com/upload/files/suwikibapavinexixedu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ad7118d3---66809948115.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9852acdd---90959929845.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/jabidoxixuber.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zosizedexazojubetum.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a775b58a9c---vetabakadi.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/getanujefadetes.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9376b4f7---54461893541.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/donak.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/88777fc18161fc01c678663b5947e3ed/razozisasudogom.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/varapemomuperawisugese.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613879af61703---49570347154.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84280053525.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/35210144846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=flight+tracker+apps+for+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_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 17400 bytes
SHA-256: 7b9b1f3d8cde882fd00206241465ef4fb475130d6067feef92e405538f505be0
font_01_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 10968 bytes
SHA-256: 73e7fc0fa1f6a0b323ad10edd234d685e817b787945adf0b2fbf081a8682473f

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