Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e91570ec45b820…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 20:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 598dc35c5de848031588a66c0995638e SHA-1: 85d2349704c6214cbdf9d98329a316a45f883bbc SHA-256: f7e91570ec45b82020e7713cea7737b7bcf0a6b9b8474ee398e74ff28f876a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gizaviation.com/uploads/files/nunel.pdf In PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/vegumare.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/wenadozinusazonupi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16108e626d6bca---topused.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/bavigesidusiwilokinagadu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160790d626875b---89680677397.pdfIn PDF document text
    • https://istanajp.com/contents/files/raxigexizofegitiz.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/tolewerixupugemeduxewasa.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b503694f1d---99879364033.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65329793462.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kasofi.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xupikisozif.pdfIn PDF document text
    • http://888chji.com/userfiles/files/figujedajex.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd78603c7fe---61750509704.pdfIn PDF document text
    • http://coumert.com/images/file/notunirumusosewekibuf.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109c75524fee---liwevetedapaj.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/958acad3c8635598b028b21b2608ef31/96669001625.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/76745364322.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/89032772895.pdfIn PDF document text
    • https://netpage.info/userfiles/file/27934219642.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/86628952621.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16124246dd7428---68887766131.pdfIn PDF document text
    • http://nessium.net/userfiles/file/54672577433.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/32488863629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=contoh+proposal+skripsi+kesehatan+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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 14892 bytes
SHA-256: 3a09bf0c68fa1515c623b29407ff77ff199cafc7fc836f4feeccfa4889e19f97
font_01_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 10716 bytes
SHA-256: 175cc840f80b7c857e5f7c2b120c1cf6ab0d4905437314dd832f60ab2e79aa87
font_02_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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