Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4693d2392220e1d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 15:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4db20db6e337a1f8640fe8baf219424 SHA-1: 1844f6d9ace17f03548fbc22aadd2f5815a5c6fc SHA-256: e4693d2392220e1db4b20118e602cf2e66f97e36047f0ddece07ce2847ec37b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of direct execution capabilities within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddc7bade55---67985052210.pdf In PDF document text
    • http://geose.ru/userfiles/file/33636528756.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/966e69c90d6414a33930f8638c379e45/lojogaz.pdfIn PDF document text
    • http://xtra360.net/campannas/file/33707067964.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xujivaladiku.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/nogosabarebedenat.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/buxidir.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dcdb10592---vanig.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/12284701687.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c149ce32e83---rutuvoziv.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5dbcofnnlholdlblco4f8103bc/39413661767.pdfIn PDF document text
    • https://wildnaturetravel.com/File/binamupabarat.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zufibolivivibiruluvafejud.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/102eba3f684ba9ebd294f42ae5612a9e/vegaxozorafo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20f2abe64---nudogi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/buzuvixer.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/dijuwopuxododaditix.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4dbc4d3a---14366669582.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0b980cd---41777317864.pdfIn PDF document text
    • https://vestol.bg/files/file/gazuvotomelebejudu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/2679765247.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/nubofimemaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=information+memorandum+filetype+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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 10656 bytes
SHA-256: 3fb8018d7ebc7ad626ecdd0e4bbf9d6f47d25f1fba5265f506e123c2fac80e42
font_02_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 16144 bytes
SHA-256: a53db1237fdc1033cbeb8c624035bff1d3caea95d72158f6f172325d600daa71

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