Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e97cc2bcd507517…

MALICIOUS

PDF

92.1 KB Created: 2021-09-21 21:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7392c7de46cb053d3e56e5901c5985b3 SHA-1: 439a30dfaa3a878b302e28c8a7cf542bf2cd997c SHA-256: 5e97cc2bcd50751786e85182c3abb7afa4aa3e0a5bf69af1c6af1f328b6c88e8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://trisyscom.com/userfiles/file/39199736922.pdf In PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/gesilitivafelizukimupe.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/31259989016.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/20993224838.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/40201462689.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/49746495999.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kudud.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/revotozufu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/43220533458.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/jizofezisamusakonet.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16144fbf2d216e---81614531961.pdfIn PDF document text
    • http://cwesp.biz/upload/file/97169844184.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/55687726305.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/xupuwi.pdfIn PDF document text
    • https://drlanda.hu/user/file/puvepine.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef8e9744ab---89382730714.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/97787101215.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jasemamisajufaruzi.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/54814023946.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///46606437046.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/giwij.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/400b16b3e9fce396e47e4d2301949b66/30237211093.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/dafanurivagukuwafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+demon+slayer+mugenPDF 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_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 11020 bytes
SHA-256: 44153853bded1565c95dd24d79fc1e6d294188781cd1da95101a01b1b061808c
font_01_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 18944 bytes
SHA-256: ad6f6d44ba753a2cbecf747ea4a649c305c4f9b241e03ccdfd2386aa992a6fd1
font_02_sfnt_off00014b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1