Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b0064258c84989…

MALICIOUS

PDF

76.8 KB Created: 2021-07-21 13:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b74a540da0496c0a3d5808cc29446dc5 SHA-1: be6b978d58c7ffb1df40bea29ee5109b16e33032 SHA-256: 45b0064258c849899f69a98e897126d7fe0c41c843212fadb9b3d9a523faaf35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised CMS uploads and disposable hosting further suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://bagiez.com/userfiles/file/40223228150.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///78802712823.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/92110883913.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/36711041644.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/93b97e1b752836a54d47505491e8f78d/8285782156.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6885c3c1e---88400474858.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210614011832.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fifokawuwozufozuwuwoje.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/37888984229.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8h40onv275il5r0nhuj9lkmrv6/zarisakanenabaz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e7c4ef09---15650258740.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o39s9obk74othtfj7c9sstgvro/nupigaber.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/36348616538.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e6c422965e1b752e839b9546c606c642/41219001824.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/zunizavoju.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/letunebinakizuta.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c53c110e316447cb7c7086cb082f5646/53713319773.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d6a9c47de02a6818afce7922d586f97a/rufoxikulewusixajuped.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6794b67cb---96299480468.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/karojo.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/2309407231.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/14731008822.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/dawuwipemevuvulakinuralo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/mopagopedudajovo.pdfIn PDF document text
    • https://agatanorek.com/files/file/memeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+investment+banksPDF 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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16800 bytes
SHA-256: 6a398966dd09c91ed3a629824f37b6f335915a5526da5fe918dcae6da905276e
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 10352 bytes
SHA-256: e059d4dac5305033b5fac89e9b5ed969f0105f7892dacda2a3fb5b53c4583a09
font_02_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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