Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e18366c84883942…

MALICIOUS

PDF

93.7 KB Created: 2021-09-01 05:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7a76c6553f8ded8b32a7d2a0f57db19 SHA-1: 11edb23e5414c1332ccb95d6f18c939520999b4b SHA-256: 4e18366c8488394240fb0039eff1e7cf1393d2ce348bd90dad282b169ce3447d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming and exploitation of content management systems. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://yulintimber.cn/d/files/fowekixogoxazefime.pdf In PDF document text
    • http://farmaciafasolis.eu/userfiles/files/xasawuzuxu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/beliloz.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/39459215895.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/mejijapetak.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/xotutavise.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/75263474883.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vuwadi.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/98fqb7u1f6sb6ggcqd53uq1ps6/pomitum.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289745ef1c---65499864464.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/39907367123.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21f8ab7ca---26828069046.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43629f144---zovakesekux.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l7vvvdpnk0seevv68tp2og4nmd/86640986518.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nfkrju30su5l5d4ep7ie8hk0b2/21751651254.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb4a5c914---vedovatitepewolosogefe.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/93977244183.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/67051647567.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1cbb63cf7---53385629445.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e37a278e---janupavanuvelido.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9031ac5e60---tovafipelafarateti.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/bakunaxuxavale.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5e338144---23138324172.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4347bea4d868f9589210ac4a2fcbb664/zajefosasorovobupubexex.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/uhcdlm00gi3jgtu7b68gm08atd/5900770516.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/kujapelad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=collective+noun+for+storksPDF 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_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10456 bytes
SHA-256: eb2e916088808b8005dc64f8a3262eecf69e31f1ab0c9938697e5114afb1ec36
font_01_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 19712 bytes
SHA-256: 8efbc7e16bb67072989fb7d9067402a32c13c086a9630f6518e7cd0289c4673d
font_02_sfnt_off00014f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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