Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd9b67dd9b71716…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 04:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4fd9a5f39ae3a9154b2b27c8eae8f93 SHA-1: 09706e257bf9212c26c2d1fd77d07bb12a334c47 SHA-256: dcd9b67dd9b71716f369ed203165ff26637636a40cde2cee0d54c6d2ef596db4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains multiple embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cfc0db82f2062862faddea8f31a59e6f/33628451798.pdf In PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/kezibenim.pdfIn PDF document text
    • http://ud2-140.com/files/sipiwepafenogavinedogaga.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/42405274065.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/lebeka.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/tubalepizotutikidif.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903083720.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/54785428292.pdfIn PDF document text
    • https://maria-galland.ru/files/file/16713576783.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/91468002189.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/edkp816c6k5g81eodjnag5snpf/vasixavax.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41060d3be626fa261370c9fbc1c6183a/purojefitivuxajudated.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/2489049179.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/wojororenotorib.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/88398411687.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/nelefegegasegox.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/85899809925.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/65973299412.pdfIn PDF document text
    • https://robodom.si/files_vsebine/9287405278.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b68c59e2---89286990078.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/suzoweromap.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/kakiseluwakedig.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/65197476888.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88a6e02fe---detixubedoxugobuvipirenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+reset+network+settings+do+androidPDF 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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 15688 bytes
SHA-256: 2dffc06c69d3058ef4d13e4c6f988e69fc7e73c44681aa2356db54da830503f7
font_02_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 10652 bytes
SHA-256: e41a5593bef7b418d979f7d985093547c5dd5e868631653a43f8bd2ee69de5ca

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