Malicious PDF — malware analysis report

Static analysis result for SHA-256 a143731340c3c3e7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 13:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cb61375f614adc02ab7e5d9cf42b047e SHA-1: b73ef59327ed85d95bc72848bedbfe2c90e3bdd2 SHA-256: a143731340c3c3e7ebe9e406de4d7c21cb3e45b6e77113d06241fb9d3493bb30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://queure.ru/uplcv?utm_term=gmat+pdf+2018 PDF link annotation
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609897d0c6536---16539102605.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/27be72b23d9a8cdaa5e037852916cd08/menem.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1224f80cbd---difikobulubepebubelonebu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/povajojaduxovigapu.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/64296479631.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210626_96FA66925A9413EC.pdfIn PDF document text
    • https://paperland.bg/uploads/file/15694526874.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/539fc9049d2bfc955fd30b365cccfd9c/fedogekakokoporudovezotu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/m4nu7sj3598kh33f95lqljrl11/56002311750.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/fikepidakupubuxelekotinaf.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/s3hrookidoi0rfj7g77e6ebgsj/3954507165.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/vagefamel.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce548dcd7e5638aebab80caac3933cb4/gojisebevosixufepe.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • https://mondialardesia.it/file/84368955035.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3212d24c---98347718853.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089cac13f1a8---bopaki.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a97e9de9---76287552763.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4d1968ab2---33311217290.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/lunepef.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/suvuvokigifexuv.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d221ee53c9---sefibakubuxowokijirobaro.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/49025276199.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pefakigowugum.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gisageniv.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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 17844 bytes
SHA-256: 8d7281d92f680b259a31b70c7c9bafe678b3294aa074513a423c71a524f93c46
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 10436 bytes
SHA-256: dc4ec47f405d6996ebdfb45cdf8e4fc7b36f62e352112a6fac3f9a89cbc0cac9
font_02_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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