Malicious PDF — malware analysis report

Static analysis result for SHA-256 e194b6bf1a5e816d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-26 09:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4cec70f483225ff8d4dd4225d7aed898 SHA-1: 8c6a58886b9666bac92724cca5c1d3696faa4c6c SHA-256: e194b6bf1a5e816dbaecf3fef0248f14fda81d1d0daf32fa9f9c41f09ebae267
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://darstin.com/userfiles/files/xifirevad.pdf In PDF document text
    • http://sapaelitehotel.com/webroot/img/files/87260497920.pdfIn PDF document text
    • http://ssp.by/var/upload/fajusuxuded.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c40ce9776d---sebufamekojaromebuj.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f973253375---3507035773.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142d21f95f3d---zujenutokasavinar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6f8d42e9---napapejuz.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/98358935570.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d15cec31---zipuvajekaneg.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/maxowelebenubobi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614990f7b7913---25593036845.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/44053610911.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/69549146822.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01318a89c---36331278303.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/xujuperu.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/jefavovoriwalonozunatubog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f206f6c6---88025905417.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/gadojazugu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nebubibixedarojib.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/mubogomaratopisumi.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/zawuve.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/godiviferaweremazumo.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/wuminagusanoxixoku.pdfIn PDF document text
    • http://446888.top/userfiles/file/pavutexa.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/67522769430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+android+benchmarkPDF 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_off0000bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10872 bytes
SHA-256: bc649af2b4c4571a82e1ab5e3659454ef1ea73b676dffcba12f52f74e65b1759
font_02_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17984 bytes
SHA-256: c03f7b216a0a45c14329507eda4e4e5524d0d537fe684a3f9a05e9478c2cf509

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