Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cac0e61141d5e0…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 17:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d8c1a43e7ad3f854336e02a304dbc7a SHA-1: 28cdcf3c6de341ea1e560102fd56e03316554e16 SHA-256: f0cac0e61141d5e021a6322b68149c41119a8245662e926224f0ef80f400ecf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://autoandtruckrepair.net/nbloom/fckuploads/file/54339638579.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1673236109ecd0904c919dc217416efe/73998779489.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072666271d48---mubalosijulopoposijumuxi.pdfIn PDF document text
    • http://wohingltd.com/userfiles/50217544875.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tozobuteriwabis.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a2166504ad3e7d596fadc59489ebfc43/43409042508.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/nufonoje.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ad3942981458e1b9b46c673d81849a52/pibolewavanilobopozi.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/61817320239.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/meminejinepafisiwot.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/69889891878.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lanrgsl18d0u3cvba31o754afe/varasavoweretunozu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/c1vnrg6iitqjum9enk7c5bchaj/tuxukedogivepoxaga.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac210d64ee2---99908698356.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45e72f036---84869334388.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/meviz.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b2f0ba240---21459465667.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936b75f22db---453108714.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/tiritopijejolologazewam.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/naroninumatosofikuxa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zufimugopajikamemusafizo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161165ea5ed722---kavijeruvoforudogelivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=selfish+giant+story+pdf+downloadPDF 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_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 19708 bytes
SHA-256: 08d800de39c6659673d9b27ebc129422f74b9f9ce45780b808b2fa437c55238f
font_02_sfnt_off000139ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EA 11052 bytes
SHA-256: f09289ca7ffe7aa720fa311c30699c513ed0427498d17e1eae2aa6ba89f6b07f