Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50ff1a9970e2a20…

MALICIOUS

PDF

87.7 KB Created: 2021-10-16 05:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b79617a3a43133463764fee50232c822 SHA-1: a545b0f14a16e087b53145c18950afe719f41be6 SHA-256: c50ff1a9970e2a20a297dd92319d27f9ced4af1b1c18565853e9956afe992d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161537662c829c---30589465668.pdf In PDF document text
    • http://reklamaopole.pl/userfiles/file/33274536411.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaebc0358d---faretawi.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/wuxezabuk.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aec6837216e1c4de6a4d443e91e6edc/vakajeribasezag.pdfIn PDF document text
    • https://novitas.ro/files/wubaratibexoz.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210918_71EEDC58784E5C72.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/24328468675.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/mazupifedijemewojugowig.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/18487511374.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615b8dac1a65d---40332982008.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/bakelekuna.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee800e9eae---38765027402.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lekavamimiro.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/87962582331.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/nojobuberoxekutegelisimu.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/fibotabasu.pdfIn PDF document text
    • https://ismart99.net/upload/files/lolisexinotavodigufifojed.pdfIn PDF document text
    • https://dafelia.com/files/87451339969.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/94646869472.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/32203466883.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/78958165908.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/28854132303.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/setelibavozerab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=ap+human+geography+chapter+4+study+guidePDF 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_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16556 bytes
SHA-256: 270d518abdc0f337d87c58877fd1bed3a657f7cba5d9d3dac20db5395ca8e938
font_01_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 11188 bytes
SHA-256: 3b4cd7e1b51583f5daf077fd57155e5cf284d2b831c79c06ef1ef17be1c27e88
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.