Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a1b441fc0a9424…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 16:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0878436cd82b89834c1801d02a565b3b SHA-1: 1a108119a8cbcde21650414eddd6569c31c1c488 SHA-256: e9a1b441fc0a9424d6467fdf3732f9e6f9255059d14e0ac660207ea9f5639c3f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but indicating a programmatic approach to creating the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412ae400906---63712078280.pdf In PDF document text
    • https://hattoco.vn/images/ckeditor/files/motitoluwalifov.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/10482641679.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8482e3cc---jolabulovozufo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040226557662.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/44702091689.pdfIn PDF document text
    • http://expresskaliski.info/file/34778526646.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/11536378229.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/6205263274.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/65303966445.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/75aea3ca04ca64512ddc4daba79a0a2d/fuxonipifogapirozagizukad.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6db747ca---dewesenemalajiga.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/gizomibixurep.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/befanikeganewib.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lokunapala.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/90377662519.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tatufawuwowofamatavopufi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/23227899361.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jg3rif9b1ecf5l53da3jhcn9if/runozipebikojazafo.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/71078827465.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/jomixabaselu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/14242974103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+track+lost+phone+using+android+device+managerPDF 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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 16812 bytes
SHA-256: 53775b85c96d007bc3aa4ef8371f525a5af9c103e699b3cb184093d1adab7df3
font_01_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 11296 bytes
SHA-256: 9364f45102bfacc1bd3e54678e237c136000a98d5bfeab0d39164b2bccaab856
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.