Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f967c0c487d4643…

MALICIOUS

PDF

94.3 KB Created: 2021-09-07 13:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 485c976e263c9402a1b4d9ef09b75a84 SHA-1: 558bc0b0797ef7a2c417c3e32b587fcdbbd7cae5 SHA-256: 2f967c0c487d46437d0180bac6f02f68ec57e05a5d42447feec80419f5462449
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://doktor-okonski.pl/uploadimg/file/57433996247.pdf In PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/bizozamebeladu.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/kasijofokib.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40125b534a---10794418514.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1075ecbd88---50234789771.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/juwulevisutenubixubonoz.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/87752491570.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/bafajogi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jebs3kkfu86htqlldu8t90udie/zeposufubaluwemawazov.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609336cac35c6---tomixutijemuli.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608542bedd6a4---93434296381.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bd220688c7ac248a812309b81786099b/78553101791.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7019cab615e19b1d060e38c722ec6d9a/gavorobodifezixebojapulef.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c4311a9e241.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/degidenuwaliletusapam.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/19936139329.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a47adbf7---16280918000.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4b65dec62a0c178b8ed0e7b9b1554bf7/44769434224.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/59549181423.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/kamofuki.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pisoxejuzejudelor.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dibudorikokive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+spanish+learning+books+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_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 19144 bytes
SHA-256: 5ef7bcc22700fa6c5a35d88f21c422e6010162d501308c13430d75b7da892f90
font_01_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 11060 bytes
SHA-256: 069f5b9ceafe472eaa9abb3351b1951187b8460bf67043ca956d643bfa15a674
font_02_sfnt_off0001537f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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