Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a964db026b75d9…

MALICIOUS

PDF

115.9 KB Created: 2021-09-02 13:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1065220e763179978823affdb4ef5de5 SHA-1: 1645b022a67bf4687f5cfbaf9b506969c7904180 SHA-256: 99a964db026b75d9b35564e5746e279cb418bd435396e80186692c0c7eb6175e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, likely serving as a link farm to distribute further malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d5e6qa3uuasefs9rcvbqjbhui/xotamoborezu.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070a235a85fd---bevezodanewunapalutin.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/33797184386.pdfIn PDF document text
    • https://marigabung.com/contents/files/lepokewupamowe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9813ae2ecf---lobuwumosusiwijetuwed.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1477cb186c---tafexa.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sk6stm8q63unhbqq68u99lg897/ruvad.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160963058ce3f3---58883877176.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/fazid.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/3427827147.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/67244592747.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d46e14d79---puvenoro.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/notifopufabitojaj.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0c7926f7c884de2d3898c72f7f69bdef/wugameluvuvom.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/pifasagogeba.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/23906061513.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5d9169f7a---zexok.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160859d6da29f4---8944876303.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1326363917611c17bbebc5e.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/72860795822.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/78625121098.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b76cb04e---76988625412.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/wededefuzumakulimavita.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7b05a4b1114244d23d12e6471f96068b/93388178077.pdfIn PDF document text
    • https://motoralbini.it/files/file/67308095634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cisco+subnetting+questions+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_off00015fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000177bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BF 10904 bytes
SHA-256: d0064f7b4571d764c6c9003beccad673ce645567903cbb9c7c8c03606795d631
font_02_sfnt_off00019065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19065 18848 bytes
SHA-256: c9da7b6245d8d941804188493dc0b1aa9c2f263f29bfb8c6d7955fed2f9366ca

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