Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec07f91528fa7a5f…

MALICIOUS

PDF

77.4 KB Created: 2021-07-03 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a3aebc663bb94e53508782ad3ab7bc3 SHA-1: b51d222b99208284a2c8cea59388d4156c71ee36 SHA-256: ec07f91528fa7a5f2889083bad4daa8e88557d1c423bf32fb59199aad2e9904d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the malware detection strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://e-cluny.cz/UserFiles/file/37280625992.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/rujafaso.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bujuliwekonukixexonijidim.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce14f87b62---85960833424.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/56119764440.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/44166991756.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c42ae5a2---nakaxumasutatikogev.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e53c463b---siwabagexufo.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/riwuxepowotexesevimipa.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/42150032448.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/70581752746.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/87193083198.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/nuziremitegosanufomopajaw.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf9d37ffc---nugimajopuf.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/55578989901.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/gitedebolusupovufegomu.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/51785453584.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d6cfdc2586cced2f2606a0fefbdfc5e9/xuvadezugixunakoxikamoju.pdfIn PDF document text
    • http://armanetti.com/images/12529059763.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/kunoxumivugakafifakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=simplifying+square+roots+worksheetPDF 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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 16192 bytes
SHA-256: d46a6ca76905d8a48d1d4c9195e67c8cf8caffc8fd1880cbae1338fad4e6e206
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 11420 bytes
SHA-256: ae4bfab9af37ce55ac452712d77d1460970cd54070a7b835622717b7f30377a8