Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c3ff706472c7dd…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 11:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5f6ab8c41794b49229f5e427042bec6d SHA-1: 2448c7343a6ebc4a972f93b41b42d9500edfd34f SHA-256: e2c3ff706472c7dd8292b14f4c722d19c49dad159729fa0c1ea0fee08bfec067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The presence of numerous links, including one pointing to a WordPress upload directory, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://3gr-group.com/ci/userfiles/files/12991184437.pdf In PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kuxilajorawetirat.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/xesuveregor.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zinenipitakisirirep.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/nepidumed.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/nunupuwuxuwumanipod.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/sujofekezale.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/40749747469.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e50988708---kupejiwururege.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/wadiwumesupinexet.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/wubulofimava.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/50152137175.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/58389687508.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/59969648041.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/7301625919.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5bbe4bd07---rurufadomupefor.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/80320355167.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/32849889972.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/delidizavapunotegux.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/62322645538.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/38998553334.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dodakituligega.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147071255e6f---pujaxodesogobew.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ffee7b1b5cca04c3e1620bbda541aa44/vewixofoxobebakaxebinuj.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xofotofuxiwofusam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=flight+simulator+mod+apk+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_off0000b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 10960 bytes
SHA-256: 7551bf33ab63094d2853568fc4b05d60db2de0352364e039f050f18066908064
font_01_sfnt_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 15076 bytes
SHA-256: 08d9af67b0ef5dc53ca0589c308d21c064cf49f338a76e0b32f0376c8c50967f
font_02_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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