Malicious PDF — malware analysis report

Static analysis result for SHA-256 740605c50780e834…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 02:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cc29af233c78b2237e929610d334d46 SHA-1: 243cd457911915ab396ce63ae3c33b8c601e21b4 SHA-256: 740605c50780e83440125bbeb5bf1e45bd5394e60804280be775da4e2349fba7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://hoya-system.com/uploads/files/202109151625263360.pdf In PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/xetonusupipababikofatanab.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/kajujunotetewewemadan.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/31a0e1a765d39b03a8b1b907f0267e36/5391761963.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/sugoluvojiwedojuxiwe.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maxijoke.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jogudizuje.pdfIn PDF document text
    • http://greenglobepms.com/uploads/25988445936.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/46535178522.pdfIn PDF document text
    • https://inarsindbari.org/uploads/94195736657.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/wobiluwekifuve.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/tutirod.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pavasowexul.pdfIn PDF document text
    • http://halaljones.com/uploads/files/xolujakozu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/8436616464.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fef85d59ae---vudapo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/56496057633.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88199d3d1---77768541874.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161300431cfeb1---22770789352.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/81726956363.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/zevesoga.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/21989175675.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/finajokax.pdfIn PDF document text
    • https://unosms.us/userfiles/file/55651520803.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/nuvef.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gemoguzedivodomoginojo.pdfIn PDF document text
    • http://jcpingie.be/public/files/9888189189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+stop+auto+download+in+androidPDF 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_off0000cab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 16268 bytes
SHA-256: 7da5dbdf9b7dbddbe05c746d4b6a0d9234813c1d0c1c7ce09764885a8e9346f2
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10428 bytes
SHA-256: 55e9b5941f6ffb095bfbc18ca52e35c8c38b810084fe19c7953f0dc3f8b1bcc2
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1