Malicious PDF — malware analysis report

Static analysis result for SHA-256 474a81de7900a0fd…

MALICIOUS

PDF

93.1 KB Created: 2021-08-09 07:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20cd8be28b5fc1045068522576d1e9ae SHA-1: 7c4bc9c6a93904a3029a501946f3999f658c897d SHA-256: 474a81de7900a0fd376865b209d3322d286da9eab79f72b93b8c00aaedcb1c71
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://daiduongmetal.com/uploads/ckfinder/files/60633660623.pdf In PDF document text
    • https://vmwarts.com/ecovic/file/turatuzowas.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/talagalovejajaki.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210616124323_1796664102.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d1100715---givobejalemixi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074088898012---xanemoduvetewavorabemige.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/643gv16mguslq3t8cvkghodub6/gaxowixedafakomimom.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3278ed2b4---19151659935.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ee97233a98fa5d41bcc17e655b959e45/gelawexumapakeparikar.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/76726554076.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/59945399528.pdfIn PDF document text
    • http://pusulacampeyzaj.com/images/media/files/pazokate.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pasew.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/12333728255.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/fizuvugunofasalogag.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wudisokinuzeja.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f0580071---nopinapefoxot.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c4902c3664d697fe724e77cc8f2b5dc/35315646892.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/kasozasexusipigonates.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hh5c3seb87ak39rpbjkpkis4l9/63389386915.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/puginuwitatovurok.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vonedu.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/rakuzob.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbf17ae2d---doxilipixejalugadojavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+i+took+a+pill+in+ibiza+mp3+songPDF 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_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 11052 bytes
SHA-256: a71ca950690bcd8ec4faf75e175d9f6ea46fe7352739a646424a6f659511a109
font_01_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 22764 bytes
SHA-256: 9dae1abaf4d4c652010ce3a5ef4ed3c2bf74a2f43838eaf54ffae5717dd22160
font_02_sfnt_off00014c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1