Malicious PDF — malware analysis report

Static analysis result for SHA-256 59726dd50fe89886…

MALICIOUS

PDF

92.8 KB Created: 2021-07-07 06:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d46724e2fb70abd67338b5031dfa1ec SHA-1: 6f051060663e959d8b3e9d9e445cc83c8997e866 SHA-256: 59726dd50fe89886a11b8a9c01c6ed583ef3faff6d612a91fc72a20ab64c5cea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm or redirector to malicious sites. The presence of these links and the PDF structure point towards an attempt to trick users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f317d40789417467d1651e436c41c16a/taxojudedodinitevop.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h8l0tp0supr5ddk9927og9cmsu/87654575613.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1aa158f72b1fa12bb1939b74c280498a/bekewesoxigamewojemin.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/pozeresitar.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/60098252890.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/81d3236933b1f488e707ecf136e81e3b/midovazopidetufukizine.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/43729228037.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p62g0a4st4jbivcfq992tu2gp2/wesewesiwalenudoguxepun.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ju45j4428ht7hn235qm2rbu2n/pisupememuwapesarejujipo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160832050cc091---42214325636.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/64726209226.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e2b3a1a---5992746114.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/n7kokr4smc0ssrsbjss8o1lh4k/58373670022.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/danuzoropovigiko.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/48b083653212f9a70f77752d0907e59f/84328464282.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vozufugoni.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/32582271766.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/59343010318.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f1f96e8022c04bc1a93cefcefaebbe86/83061196175.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/h7gq5dc76h9rkpae4stprula5b/risudibasub.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e6dd347ca2d82410188bf6186c97f97/tibopususamuweduwe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ctd8ece7vimt7pubn1oav8il6/wewax.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/48ab90bd74da8e21257d0b88950aace1/dozulenaregimatulagituf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dismissed+on+standingPDF 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_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 17372 bytes
SHA-256: 9ad1485c699dd23c05c55ab1347670a5316fdd32f3fe81929e9143ba1c455248
font_01_sfnt_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 10444 bytes
SHA-256: 45f661f01e4c8076ea93cdd9f15388f02f81e1ce258becbca3d732afe739d8c1
font_02_sfnt_off00014ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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