Malicious PDF — malware analysis report

Static analysis result for SHA-256 d159e067fa149084…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 06:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 609bea90cff0de436178c5471bd8f0d3 SHA-1: 02cf1255ca1eb8ea78acf44e531299b50023a041 SHA-256: d159e067fa1490844ba204fc3de7db967697652c0cdb855964c9ac5d15dffed5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bfbd711a1fa435ab8bd9fbbb53e1dfb4/32678764081.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bee90a90c6c---ziseliruvokagedakigodopo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124b5bbd9dea---73065808773.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tisixuboluritijo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/pevalukuximatunobe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nin94c4ud6sgopkir4sooktva5/jovajulodafefowumugi.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/tobugozudufabugizumudire.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/jozuxipadoradudo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/mizenejuze.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gosoto.pdfIn PDF document text
    • http://toonesk.com/upload/8939316197.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/65034538295.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/kuwirekunidisijinuxunu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b103bd1f9b8---peroterosorusasowobofit.pdfIn PDF document text
    • http://flexa.cz/docs/file/10605945397.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/48586856c13bfe6cd8cab62493ce75a7/37882017182.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/mozirosuvepol.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pasupimenopa.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73419257876.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/mesejizarixabunajazim.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/83946838868.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add801c79eb---ravirivoruramevef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=present+and+past+tenses+mixed+exercises+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_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 10720 bytes
SHA-256: 473de2bdef3b0d097740e2c4006c9e51ec5b60140a03cc3c39da0c8dfcb3cbcc
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 17188 bytes
SHA-256: 2954f42bc83d7174c4ccc6181278423bf9ce5c9dd00b363f8fb573b79178ec85

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