Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95e6f4154d42921…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 12:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 961e22b846a0de44c04c562634a2e971 SHA-1: 84f006f1c9ed2023d5f5b0c7b60ea1e4df1a828d SHA-256: f95e6f4154d42921d07da1244c6f62420194a866b396024181d6a877eefe6fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=experiment+z+mod+apk PDF link annotation
    • http://smartpaintingplus.com/userfiles/files/fubonovizoziwev.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/totitizerala.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/95506153464.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161302c921a56f---veludepabitasarove.pdfIn PDF document text
    • https://e-midas.ro/files/file/vusorarek.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/37488808949.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/sitamub.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/39084506580.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ad78a777c679a2e34f3106c7b31b4135/sagilozipilaju.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/50673697605.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/pikusebugo.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/92605511714.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4440655595.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/91848185839.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/busov.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/zepid.pdfIn PDF document text
    • https://invision.buzyhub.com/files/74074700752.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunudevonurenowovivakita.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tenonumavot.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51867865820.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/19347591356137e9af9b3d7.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4211760c---fuzemi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/5898150122.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/98818138535.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/povifurepi.pdfIn PDF document text
    • 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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 16944 bytes
SHA-256: 4d292d840468df71d228b32d5d6d43dc553cf49893df6903c71f893cd8cf3d79
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10576 bytes
SHA-256: 61edaa2f73f1c14d9bd0ba7d3bef9a6260d224fedfe26f764c8ca59bc1b11c2c
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1