Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bf1433a55bf4ec…

MALICIOUS

PDF

98.3 KB Created: 2021-07-23 21:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 689a64e485373b97685fd7045e7ec27b SHA-1: 863bcda4f37f072bc79d59e46229978efae42121 SHA-256: 45bf1433a55bf4ecb2775dae4cac1af5875ee489e171b2ff1a5b81f59508ebcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mn97cid5ucg6uirqffua867gg/molet.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d11789e2e5f034e9c2e02ec80432e93f/41979191274.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/89407406386.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/sekugowudulofet.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/56749008136.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/437028421.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/vutodibapipifosoku.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160984f113e79b---dokawutusuwelij.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/ligidetupaten.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/64755962965.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c6e49911feb5828937215801a75b2071/pimixezefovil.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dezuzoluseda.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4l51lc8h3cm7p4uc1oqun1shi/rigomodakoje.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cbbe37b5c---25653404766.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kh94ja862drp5hm6ede1bh752/berosudefomavinelitufa.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/puwudigomave.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/46798320615.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/931bc87eb8688f432617790bc06b72c8/56486369446.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/jazidudajibanoxenofujiw.pdfIn PDF document text
    • https://geniodelweb.com/file/nemajiginalegodajusiwe.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a0930795---luxebavebim.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/msi9m63j0qitafmirgjgk9l571/2652112486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=does+2016+bmw+x1+have+remote+startPDF 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_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 17948 bytes
SHA-256: 3132102a61c3147119a61be706b549363622a96f78650759683c599f26c583f9
font_01_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 10988 bytes
SHA-256: 51baaf9e700fc3d1af1b40ec37ab6c3f554d559ca093dc878f89025bcb0b0baf
font_03_sfnt_off000163a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A0 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed

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