Malicious PDF — malware analysis report

Static analysis result for SHA-256 946b3875f06045a2…

MALICIOUS

PDF

123.0 KB Created: 2021-07-20 23:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 89563b949a3e6b44d85fcd371d70ca2b SHA-1: 505837df0890e79e5e8c899a238f25647e75adb7 SHA-256: 946b3875f06045a21684e2c69fe749afb63dd699faf11dce078837c5df45226e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm indicate it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/82vjoon0csj1d1hfq9kdn7i6c7/japumefiwodivumedijozuru.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c3115f0f---lerolag.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/62468653c43737e78f8a74c7825ee7bf/dawakezukudakemupez.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb5094d7c---feginevujapamogul.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uh8mij8ok9k61rr8teaf30il0b/17287662929.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1807a8a1---95242746496.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e78a85f6112322030b8589883f123a9e/xibepabawutetinusemiwuf.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jokera.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jomokofemesuxukoronodu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/76606f9f756757ab0233825b1e6c5e45/lolikuzi.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/zufafejarijeduwavi.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/situxalewes.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/03e60d554c43c472b1e8d3b3faf4ae60/82947743661.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160f639c6f3131---zamuzoxuvejakewinejidajuf.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rubowu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5e6io9r4k0u8ugmavg67vf1n45/12941436409.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/jojidasetugoto.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c763b97a41---gewov.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rewivi.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/kisefesukikodenenorew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+ethical+decision+making+manual+for+helping+professionalsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e33e851ea26ccb81373239dafc2d6dca/255232472.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_off00017922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19134 19928 bytes
SHA-256: 2460cf6886a0156b1b05973ca9819c44fbe160cce714c7f6f5461e64a8b61130
font_02_sfnt_off0001c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3E9 11220 bytes
SHA-256: 0a449cfbefb3004ddb5b5afc54d04651079f294748b833e07f31885a961ba820

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