Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e149562ecb898b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 22:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7ab765bfb9ec4291e3775686d758083 SHA-1: 080d74fbaeb7fe15ddb0014e5523573a32da2242 SHA-256: 41e149562ecb898bfb047d6b0f3ff033c9457fb034c147de7e9ecf0d20dde78c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://10kshot.com/customerinterview/ckfinder/userfiles/files/kuvaraw.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832a3182a9---24961820207.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79100876520.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mukamugizuradon.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/67084428120.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zanig.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6c3aaed545f1ab7f1783a5ee4143cda1/12672871713.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/bakobekibagalovoxag.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/71593167899.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/81677978327.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ece97750d1---15744947962.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1b8ccf96a4ebbb59682f061490b7ed88/73180974761.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/97267515866.pdfIn PDF document text
    • http://esistore.be/userfiles/file/nevaxelumodijatosixakod.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2a2f9afda652d55bdc7baaa6914abe81/23713749198.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd4ed1856---dikaladudobubuzebo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/523069645d3c696cb86fac1b9634657c/welawewurexepusozovazog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7484e3cd55---74837931989.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vagexudakuduroxotewena.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/20787847991.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b9aa7641---gabagiwetazumutolelali.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e8f9b07e---fomonivugemuwakogujav.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082c593308ac---nepukafajoj.pdfIn PDF document text
    • http://demkapi.com/resimler/files/66852446652.pdfIn PDF document text
    • https://viettrungson.com/media//Files/belofurezatokas.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd55cb5da82---wujilesasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=yamaha+f51+keyboard+manualPDF 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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10876 bytes
SHA-256: 9b3ef7024ad829db1e9dbf5fdc76e3a39ed0205956fefe9c7b83c866e4b44a34
font_01_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 18164 bytes
SHA-256: 4dde76d956fdb752d7b8f8c1364409649166f3029426c0997c6cce22372b5819
font_02_sfnt_off00013fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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