Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ce2b900c54b03c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 15:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e60c9101e4b3ca4ef07695e05aec9c6f SHA-1: 85e96fce2ee12ccb3d75f9e9ed4a3426dad64929 SHA-256: 23ce2b900c54b03c1c9a03894c2da3b0a06acf436590449c5dff51c40f2357b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.sun-green.eu/ckfinder/userfiles/files/numedosufufunelazukovi.pdf
    • http://stonebreaker.at/zuvimivazuj.pdf
    • http://salman-is.com/userfiles/file/63976496512.pdf
    • http://inarchengineering.it/userfiles/files/49066723191.pdf
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/pikudexurulerabaneverarot.pdf
    • https://truckforceone.com/upload/editor/file/tedid.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5765b9fd1778244b98975613ce22ef0e/vedizagati.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/pufinenofulajij.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614099d151bc5---topona.pdf
    • https://siemreaptraveltours.com/userfiles/file/77173949479.pdf
    • https://aynispirit.nl/userfiles/file/7542275424.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/929768e7e8dcb8ecc14ca73f3dbb3dbb/tudisalilalujerox.pdf
    • http://isdoor.ru/uploads/files/83796843572.pdf
    • http://sk-massimo.com/js/upload/files/lapodibikog.pdf
    • http://foodchemsino.com/d/files/paxize.pdf
    • https://citrasas.com/ckfinder/userfiles/files/poxakefod.pdf
    • http://richardchong.com/userfiles/files/tuzetifoguladozapef.pdf
    • http://sklepjola.pl/userfiles/file/99896691076.pdf
    • http://noithatsah.com/webroot/img/files/51816756148.pdf
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/43883663737.pdf
    • https://relans-nn.ru/images/docs/file/bosoniluziditilobi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=james+dashner+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
font_01_sfnt_off0000f378.bin
e0893075ab4aed05101d90c02bda4f7e1390772ab2d81c84c60dc730e538dc34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 18152 bytes
font_02_sfnt_off0001231f.bin
cd403173c5bddb0aa0024da34763d58066ea4c4f5f7c13688b440008f972881d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 10396 bytes

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