Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11d9179bbcc4095…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 23:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67d49e953e93501b8d1d835ee5a9caf6 SHA-1: 0a53459f827419d403310f59ac2939ba5045f349 SHA-256: a11d9179bbcc4095ebe5c84c59daa0157f2b14f74cd54e9939a74058364285dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to link farms hosted on compromised CMS uploads and disposable hosting. These links are designed to trick users into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://chcial.ru/uplcv?utm_term=download+youtube+offline+app+for+android PDF link annotation
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tqqgji7ecn55i0anpqrignfbt6/taxumenime.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/25906300116.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/varulovusajiz.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/67876740651.pdfIn PDF document text
    • https://phunhai.net/upload/files/46855409843.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/792116298.pdfIn PDF document text
    • http://banquat.com/userfiles/files/buxolukevexibe.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/46977701255.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210915_1A28AC17BE90655B.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/23631488826.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/bevupadalowipobibimajewe.pdfIn PDF document text
    • http://namngonviet.com/user-/files/21135892023.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wasuluzogupitami.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/60246202816.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/67698057003.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/nexitetatixemivukiw.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/nowatokonewometif.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/goxawawemelafatux.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4731afd1---tikojonog.pdfIn PDF document text
    • http://voijin.com/userfiles/files/99766898895.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/butasekaxesezazojuna.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/19117489021.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/2124337057.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140764885447---38808284255.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapamewomexowu.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/24586971160.pdfIn PDF document text
    • http://gojjang.com/uploads/files/xutekete.pdfIn PDF document text
    • 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_off0000ba80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 17048 bytes
SHA-256: 2535c95262e0893bf71f36a1aac7105948896e464683aa095ca5c25e4f3fef52
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10764 bytes
SHA-256: cb2b0e7a043bcfcd4b546b099016a39ac322cd898fdc072beb328bf88e27fab8

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