Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde96ba50aac8b37…

MALICIOUS

PDF

99.4 KB Created: 2021-09-01 10:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09ab23a04b657590dea91b18b5e793cc SHA-1: 1561079bf4b9f86aa3ef58a129c436c9e2b584ec SHA-256: dde96ba50aac8b3714d972a1bde5ca9b4ec5c8fe7e031315f9656f0a94636be2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://bongoes62.dk/userfiles/file/10315816214.pdf In PDF document text
    • http://kochamsushi.pl/UserFiles/file/6756608413.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/42pi7e00h7sp2ogvljsusahdnf/14123293234.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rjth37p5q53orss0ijqq6ii7t2/lafuxewaxiferowujofomev.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tavimanuxuves.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/subetujegidejavala.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b695c3ae---9009259440.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/okms0a2tquvbda7fa9ug78qm8p/vujotunoxoludiweb.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/3365762925.pdfIn PDF document text
    • http://hanleyresources.com/images/27009648614.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/81640731670.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/28383526411.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vevuli.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/15140499348.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/lerupewokevebuvujijodez.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/jigadubisega.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/zifexafedonojukobob.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/24618832906.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a492973b0b---7535472902.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161290a47d4f90---3491305083.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/raritanaz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084142ca4d46---19216828489.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/36263570275.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/96374474439.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/roxigurapugozeletoraxipow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+of+patent+office+practicePDF 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_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7D 17128 bytes
SHA-256: e85439de094f8a001e0fdb39fe5dab3a4a443520510c6721dd1d3a0c6de37965
font_02_sfnt_off0001682c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682C 10396 bytes
SHA-256: 00551ba4e26712c6694f1e224535e493519d1306e70f35dbc7ad05f2a6bacef7