Malicious PDF — malware analysis report

Static analysis result for SHA-256 df72e7cfe7e009e0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0ec0ba4a2c557fdea125e317414c2cb SHA-1: 8cc72c31751606e42c4103bf520aa95670293122 SHA-256: df72e7cfe7e009e079ae61d74f87d3be7b7ac975de821b1411aa12a13001633c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9393dd38aad11847e31ee12f9954d01e/78939893219.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fa5a0a33---6513505009.pdfIn PDF document text
    • https://alpinashop.bg/files/furajubelipiluz.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/5415208316.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/4355878656.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xerapudigenilozaju.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/likigid.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/79770761726.pdfIn PDF document text
    • http://medrea.ru/upload/files/99241860701.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611070d8d3ae0---fudogijaxifazeruseru.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/nigedarufulepilejire.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/ximinobitogipikugepim.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/vulaxusifubajekagiraxuw.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rejoduwatowenunisu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161310b2ae2d69---bajosuniwemonedevid.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d830525bae---zajekiwujukuna.pdfIn PDF document text
    • http://katela.net/userData/board/file/3219101382.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210724_69CC9A4E5BFE38ED.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ff69d0b520d10ee4d25f8872cf50d689/jogelimof.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5deb035b9d---15579441201.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/46c0237f586c042d84c6dd8b1a368486/giwuwazagalefipenitubaw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a89710447a3e15b45628776ed2c82472/sukedovivebosixojo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vorizudixizuvotuva.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/ferujuxafikon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=boulevard+of+broken+dreams+guitar+sheet+music+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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 17564 bytes
SHA-256: 3b30f9007b81c199b35603d21fdb683430283fe612d77b845e1bf95cca209ff7
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 11516 bytes
SHA-256: 606c8a4b9751fdd82f7ef74e4efd3d7c4f62169a65d8218550fcc6c574669d1a
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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