Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4f05563b28e929…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 06:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8c406420fa2113102acf8d13b43e66a SHA-1: 247445ab3bc4c71c2039d320f788cdc4b7577276 SHA-256: ca4f05563b28e929b757abdcf232c897216210f611a84e437d628a806331e5a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/36541049494.pdf In PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/wizinimolijobekoridifumub.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_2E868D0E9E468C6B.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dedudimubelelovutulepul.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/93773269785.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/nimidawof.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/98860566032.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/5718923696.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7d198fbd3a238eea160a237ce23f98d1/6394042923.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/85235825985.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/96494532495.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/wemuf.pdfIn PDF document text
    • https://phm.vn/upload/files/jaxipasulegogijalizegome.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/48812947810.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/86578115412.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/purof.pdfIn PDF document text
    • https://derfo.info/resimler/files/95361466718.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/39023711749.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1aa9aba87ee3b0571b5cfe4165323413/67561496076.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/5565616758.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/56169467995.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163daaf5f9.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165b87b106---63967056692.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/givusaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+card+fighting+gamesPDF 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_off0000c366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 10812 bytes
SHA-256: 8113ad1c53859183ddbdce7c29e63f26f767788ff15525c58b03db2f254d1a51
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16544 bytes
SHA-256: bc8b5f45d009f87d99c1afef0befb2d166d5191ac1dab27b6a3d02ce439c3ffe