Malicious PDF — malware analysis report

Static analysis result for SHA-256 27126da863c92548…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 01:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca6dae05d1be6950a5bd3f8f736ee1ef SHA-1: 2df98a139b420c94596a400c29e68c0aa2ca4f56 SHA-256: 27126da863c92548640155af9325159cd67fc194429d3f2719c7b5ef5d5b16ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an intent to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6176478076---93153193044.pdf In PDF document text
    • http://bjjiffy.com/upload/52642346435.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/xoguxaxeduvubujesim.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tigaxi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080052fc50e7---74622534747.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/zirozuvinupizizabupopirod.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/53947104416.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/510f5d7a894436295bcf25fc8a1eadeb/63885940485.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/20234085765.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47013974144.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/f62p0mtbelm59ruv2ichfjq331/93993350426.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38b83e429---biwez.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/5693271417.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab17bad60---92653229883.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b431b0aa193---24494013529.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3uj5p11ggo2n0qa7tue9sjeash/winapuduxukipuxepejito.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/65917966122.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/vogemukusamunedem.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zemulekeruxowugulem.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ff9c5ca8bf6ff97c14fc2258cacba502/sofaxurujemi.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/posuxegalexenutifi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c27d6e03fc2eb749a9e7073395b07933/kijuzemajisawesanunofan.pdfIn PDF document text
    • https://redac.ch/upload/tovumevaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rea%C3%A7%C3%B5es+e+reflexos+primitivos+pdfPDF 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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 19916 bytes
SHA-256: 9e4e2e3465d0612377a67b816427153d89f795d49597e28390eaf1000c2be5a1
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 11188 bytes
SHA-256: 43cc834c8da55597679fc2ef989cedb723b12534ec754b25bda1db803927d8c3
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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