Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c66c1a2fe5bb00…

MALICIOUS

PDF

96.7 KB Created: 2021-07-17 23:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2569ec8fe6cbc3dee47827c0bdd5cd2 SHA-1: 43670d605870e4194f3de77b3521cde57d749e3b SHA-256: 14c66c1a2fe5bb002fe116865ed004f1d419f89f744d1f35c84d796c655d13d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255b578847---zutoligeromepepevorima.pdf In PDF document text
    • http://sbkf.org/files/files/benadutowa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb09d86d6---75099234753.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kuraladatagofusubenebove.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0826d090---zosofupetizef.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/39538303951.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210527080501.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/rawubifuduwabibovojabe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rp33jt0g3ffk9tp1im6bvj58pt/medosavegupitojavurowomar.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0vjejk4fh7l65kgh7l6ld1i4pg/50017479404.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/lifugewekeperudise.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vq740l5vgoavstu1ic62t6k9i1/53302623347.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j8v9voom64kfdjb7phhvvlcbi1/18765870634.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/miforalutadimumofakodi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c21058938---bevapolijetoxixuzijarezo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/6006594940.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd3428c94---83850382659.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c27d6e03fc2eb749a9e7073395b07933/kijuzemajisawesanunofan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=low+carb+old+fashionedPDF 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_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 10656 bytes
SHA-256: 5bf899ea103909ab5a657b7683afb9c9ef55de6caf630c748bbebc0fc9e708ca
font_01_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 16576 bytes
SHA-256: 904cad7ee454d45d66f9014eeac6230607c034eabae174d1d8323d3f9d558da6
font_02_sfnt_off00015df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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