Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c99fb17bffe921…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 01:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5898e97c57fdddb9c96b32ecc6cad9c SHA-1: a21007d2b3475dcf0c9d6cf32af628033e990915 SHA-256: a6c99fb17bffe9214e16dbf1f80837acef992803a347669bdf5299f2482dc4c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute phishing content or malware. The PDF structure and embedded links suggest an attempt to redirect users to external malicious sites, likely as part of a phishing campaign or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://coretry.ru/uplcv?utm_term=soccer+live+stream+apk PDF link annotation
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/48755986330.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f7d72dad290847872f1448d061dc46a2/widoxodi.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/zixisixumanaxowup.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/87945257250.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/xopumuxetipotebakipu.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/najixetozod.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/jiketodonerodataroru.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/lupanududimuvasu.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/bulanoteso.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/30584090053.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/podipad.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/bedubalisibitulogirepux.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/kepumasuwasipalenisit.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/dukekoruz.pdfIn PDF document text
    • http://sungder.com/upload/ravilozesuwemiguzisemip.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/jetuvagibaxogerodet.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/44459201491.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/vavokil.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/63f5e0323f5f575e1db08eabb767d51c/45971261814.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/97737334592.pdfIn PDF document text
    • http://onelove.cz/file/lawimiwusub.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/sasilamoj.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/ramowojovakunijowedix.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/834452442.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff804ab466---66942508567.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614090b218130---dekonemexebawibuminitex.pdfIn PDF document text
    • 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_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 10664 bytes
SHA-256: 69de951a85820e7cfa9f344cee58d2aab38029005a32875d0682c74ccf31bc1e
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 17476 bytes
SHA-256: 98a4b6e689100500f247627e281bfdcc2e8d953be03fbbff017bd33ad3af7f12
font_02_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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