Malicious PDF — malware analysis report

Static analysis result for SHA-256 949dc88244d139be…

MALICIOUS

PDF

95.6 KB Created: 2021-07-27 00:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87cdf5931f20fde1c2e0d015f03a8a6e SHA-1: e72dad505ba0b02013e945a4a8a64c96b23a6e9d SHA-256: 949dc88244d139be7983f11125068af3967148905d1fb3693b92a465dc256d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF structure are consistent with a tactic to obscure the true destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076001e1a0a7.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/74eed055abd6fd170755aa17dbfc2a5f/39422348875.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd998aa7c7---pexeripivog.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160882a3e0c307---78941394738.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2a71e486bf1b2b2c06aebaeeb6c20263/zisonovibusuvodekeji.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/dovejavigobevak.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ebabb0379---68060022114.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/nanigorofekadoguzo.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/19080120826.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/luvogajadifos.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/24459073685.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160e00f5a72baf---ziribibunenerafudupixamax.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/21850907038.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/kie2nf8pfopi2ibo3uvdmb7m65/74770376548.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/zovewupononevukewixi.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/27536870662.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/jejifemi.pdfIn PDF document text
    • http://texmet.pl/userimages/file/72791257417.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/dunemusarivutusobu.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/32271171838.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7571304048.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/guvamepuzibaxow.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/5634747622.pdfIn PDF document text
    • https://coevent.ru/upload/files/5563765739.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a86a6ca9---36773350278.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/476595493e577dc92374f8339f0922fd/59711185482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+much+does+a+chromebook+hp+costPDF 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_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 10948 bytes
SHA-256: 2ee653fcc67984d6c7ca6a33bfd2c983131843717115fd91ed6ac81ba904fb6f
font_01_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 18060 bytes
SHA-256: 3acee6e161a02d09085358f7ba4c8d1bb4e7d2ac5076e5310147782a296e7553
font_02_sfnt_off00015845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1