Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc59d05e3dc5a1a…

MALICIOUS

PDF

109.9 KB Created: 2021-07-02 00:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 06cd5f2840b031c9f3582c78642624aa SHA-1: 40ded3276fe360dfe11dd1f99f904a8f2dffced0 SHA-256: dcc59d05e3dc5a1ade21d94e783bf7322360564a9f8a7d2b2e0f393145563ce8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://imagebeaute.fr/userfiles/file/39651108695.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1c309f16---30953351201.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad5401a72---56345084766.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cf63a3fe---bezuk.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wijija.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/81210482587.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/9199555473.pdfIn PDF document text
    • https://dm288.rs/slicice/file/59096503732.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tobigesol.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088017735a42---sawulijipemapofelidizi.pdfIn PDF document text
    • https://tepihtrava.rs//files/xugatamikiz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d44f45550---xorolimenu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d953c24a7e---17412898536.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a1c1e9857---69414378491.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077def42786b---32307261990.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/92586103703.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf807d80686---92822770019.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/016ca8cfbe172e0609f7a9d4e0ef1187/tabadidetomojemoluv.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6a03d72a530668499894a905ab72fbb3/sopibiluvivominotusazu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q0fmlg4tgmqahqpmcm2qicq34v/judusafegowozavowi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6869d6b560---50252348196.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ede337071386171c772cc582e6da7356/73966844438.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/linipapalu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac080e5bd---76190505854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=level+32+brain+outPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFE 16284 bytes
SHA-256: 6eb162b33eb88f8db5296bdd2517b8e3d9015a108d8cb0c1e5d83c65b2485e3c
font_02_sfnt_off000162c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C3 10488 bytes
SHA-256: 38df1a808047a403292c567ae7143f931e3f796cf0f929d71cf6d8c2e408231d
font_03_sfnt_off00017ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACE 17412 bytes
SHA-256: 817c52e58c25d3b0884ef3a408fca2d6ddfbe3d3fb3d6eecb3c2321eb0b8be91

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