Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a961da129823868…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 08:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f754c7f00012a11a3f18b383d1cdce4f SHA-1: 74069c2f8fe642e695970ff2f4d8a423fdaa0832 SHA-256: 4a961da1298238688d3ad0ae6e4afaefed0303b2aee3ba89bc9de4ff6c526fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing. It contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=ascenders+and+descenders+worksheets PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8ff29044---vajejoxiza.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608883e537ff9---lumezegeba.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99baaeb2a5---ziloguripijuriripofa.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/64bf553549d090c067e5870dc4882ab4/rojanovujedaguf.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116069e260a2---rewabonaxut.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/zijemejekikelad.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/zilotibulalereka.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a21e04c94f---dixon.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rukidofifiwolefirovevof.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/60456881324.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zawum.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/53524263179.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a484beae3ad---negogalumizexum.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jepewopaxopoge.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda196e101---deguwewu.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/28277108723.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb975f438---7343238166.pdfIn PDF document text
    • https://emprenderem.cl/files/tijafasaxikepamoma.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b0de717f302704a3de94e65a9abb3a29/gaxedagevas.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62774874144.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/17313291216.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a7b5843b9507e6536f26dda806aec3c1/gatawepatugenureboj.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_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 17944 bytes
SHA-256: b00059d3c8a9b387b73cf61a3f61c2a917f80f135197a9892aafcef0938dd640
font_02_sfnt_off00013fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBA 10488 bytes
SHA-256: ba0bf011c465b7b2e31aa140ef97469f052db0f1892d914d32a8bb4b0246c324

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