Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb03daeda2ca2b1e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 00:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8f17d3289e506e59ad8dfce2bf4eed3 SHA-1: 7b615bd4cc5548aa7dd027a87dc49182ee9acae8 SHA-256: eb03daeda2ca2b1e346ba2cccd8ec4e95ba37b9aa1a911278724008ed07551cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://simon-daulte.com/ckfinder/userfiles/files/razebajisupukivizid.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47fd887e2---talolefawujotek.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1psjp3amn63gijec0vo45r52r6/vuxevix.pdfIn PDF document text
    • http://modern-pro.ru/files/file/65416529907.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/19551640709.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/14822920362.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xuninejijiguripezegija.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g1mngpnbok975dfciov9765hgk/xapifevunujavixum.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kavoxinizazaguzenavu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c15ec360---6764190920.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/331b5893f5c9afff5997e6b59c72c5f9/vitudofif.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/51710743911.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/tedevobonopuduje.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/vazewor.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/66565450008.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/29606958019.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/499425ce9e55c3951d5eb9f0019fffec/jeziw.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/zavobimasurupagok.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/xejuzuxidowofifisanarazu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dde08862434---87113276113.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/90609959963.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba44a9740ec---gevuvojovuxa.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/jigiwosunix.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b66b5812f---39292869158.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b621a832f55---rupigadaladefixajarawasu.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/60239304090.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e073e973d---tebofokunibopobege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gdp+calculation+pdfPDF 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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 10352 bytes
SHA-256: 6a64bfbf17f27cc50a04445c78a0b087647610066e89696025d8826dc757b447
font_01_sfnt_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 15344 bytes
SHA-256: 697d6702064d88efc1a58e0e8f83c2889a95d1949efaabb0dcb7e797177593b8
font_02_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1