Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c510edce62d2b17…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 23:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d83aad636e504d8fe0e8051a32839ff1 SHA-1: c091d022c191c9cf76140b321fdc6d2b76c8b4ca SHA-256: 1c510edce62d2b177eb0478f9f60bf451dfd51db6a7e10d57243947a5d8cb4db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://panziofabian.hu/fck_kepek/poposilunelasani.pdf In PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/magom.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/32nmovg24nqevrok8lp0omalim/gotiteburokopifuxoritafem.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/majapod.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jovikeridilifubu.pdfIn PDF document text
    • http://hibertek.com/image/files/20210803_045818.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/8407403452.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lhecvsi6k53seut4eaj5sa0m7e/dasifenegifixuwupu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h9roio4s0jolnugl5ulviaj9d7/78122654423.pdfIn PDF document text
    • http://dsagco.com/Upload/file/wepizowemex.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/70487162226.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///75119339086.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/1785178749.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/74268750409.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481240c365---38785084551.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ced8589ee2d4e61f221c80722f300068/81924815400.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a19391935---vijumaza.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dff0c36ac---97011771265.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83344252453.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • http://salkim.com/userfiles/file/64477846171.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/sarokegoraxatumotavawal.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088161a8ca26---41214788714.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lv42g9hh0gju5du01qbg04oc26/fetibenuladiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ni+multisim+14.2+crackPDF 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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 17460 bytes
SHA-256: 5079cadfd313f7869a34d59bccbdf88ce7ac1133093ec24f55b19c4bbe7d4dbb
font_01_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 10520 bytes
SHA-256: 40a34447bd6e8629f34264c71c499468b8bd4e9a4a3d9a4c42e7ae93142c5714
font_02_sfnt_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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