Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6ace1872ba0314…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f6a7722c6f663e73830ab2c1583cb4e SHA-1: cdecb0e0d34c979712203fa882c5576d9687b6e6 SHA-256: fe6ace1872ba0314b4ce3b91b7bd0a16e1c20fdf603f54370c51d8c49568efaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=lego+jurassic+world+game+android PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161433035abfbe---vilemav.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/84730117724.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/gosikurorus.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/fenivupovujorumusixeso.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25711855863.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/motamelir.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/75113973930.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/42369781221.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16141a90d13c13---gasoperiwuzozofomi.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/namito.pdfIn PDF document text
    • http://micruts.org/userfiles/file/fufedizatowazalo.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/85423638951.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142015bebb81---99361258690.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e640292091d9033292b8b23c1fd4a702/37909862474.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/46702272647.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bageduzezal.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vegefifefovu.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/puwuvijejiganad.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/19922227800.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/90458107591.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/mofebotapujapekuxa.pdfIn PDF document text
    • https://sino-islam.com/upload/file/260057255118.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/13437179990.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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 10888 bytes
SHA-256: 3d4f19e2f13374c54e730cddfb618bb514cd8d0b958bc85ec2bf437464026402
font_01_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 17524 bytes
SHA-256: 8d179c7bbc5c1d03280da88e2c207169bfdca3d7760a5da9bc66f1c29d56d54c
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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