Malicious PDF — malware analysis report

Static analysis result for SHA-256 c472a3f7349309bb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 19:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 456a29fcd20df9b62583fe68c8d905ff SHA-1: 8a093e1bd5d526b01bebce40f1cc6ec9a0ed7967 SHA-256: c472a3f7349309bb617332f706b1d5501e2f5dd0902101a981c47b64f2cc1800
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://keralahappyjourney.com/ckfinder/userfiles/files/pipagizonamasopamokakepit.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3cfa00fcb87d3e2ff7a5d85f3bd3e27c/gajizadifilum.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cef12f3eb56---tavedumaj.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109032238059110.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mr8j24c30hv318f1s1as6ig236/puzilajosat.pdfIn PDF document text
    • https://thepainter.asia/upload/files/ninonipisibedinuta.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/xevomanalisan.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/62320574838.pdfIn PDF document text
    • https://mollis.rs//files/dovufawetibexadowobebifi.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/77373746767.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0507ef68abe6b54eb82cec63cb801df1/jerididadedipumegokoxima.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximisisenozotategesogajux.pdfIn PDF document text
    • http://odumakus.com/uploads/files/60239898858.pdfIn PDF document text
    • http://aven.su/userfiles/file/35688792683.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/ruxevok.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/71919110229.pdfIn PDF document text
    • https://digireg.dk/upload/41773550515.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/33039406194.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77324452eb---82263938624.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1ntp1qn0v37v373qas92u3ujr3/mawiletirutetakupab.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/tizezepazexugaka.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/polexodadised.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zulozokosigulodow.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/xosugosatigiwuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=alto+saxophone+blues+scales+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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 10848 bytes
SHA-256: 2f5c46083cbb66e5e59f7050c0baf40c1a18d7b9b01af62c030768ddd7b61595
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 19572 bytes
SHA-256: 98a923e830c794a6c65e9b2271a317700e0b6edb47f41066a6efd16e7f25fbca
font_02_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1