Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf56018eadf5da…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9723b14e44aeea3f7b76a7cf67f8f7f SHA-1: 2de8f3d2763d394f5441890ae4dbe68479e7907d SHA-256: 4ebf56018eadf5da3f91539aabc8cef9912b02cfa2e2aed87813e5e711a331a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with critical and high severity heuristics firing. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nprofit.hk/userfiles/nelesika.pdf In PDF document text
    • http://tinhdauvietnam.vn/upload/files/suvude.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/76f686e6d2fc7cc11f61eb8ce1803b89/11666477831.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/40940051026.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/nededefajexel.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210905123151.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rutugoxupo.pdfIn PDF document text
    • https://regenerateacademy.com/file/risumoguxedokoda.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/12643755887.pdfIn PDF document text
    • http://computerdoki.hu/user/file/josimerusomonujitun.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/88334939727.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b28893e3---kotalupoweguwo.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/nopivonojumunepejomozido.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132db5e384a8---narekin.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/43507898717.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/tuxoxugusavumi.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/79679507905.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8331d5453---65152614296.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/dexekipis.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/bimusudorodikema.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/11445938840.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/88136960151.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/xolojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=world+of+androidPDF 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 17656 bytes
SHA-256: 00cb1643babeee60d51f026af942afe4c5e42d6d03e7988415cb3ba46dd2ff48
font_01_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 9940 bytes
SHA-256: dbcb8045a2d5bbe05f747c92e99d5282531e3fa5d0897cb493c901be155b9783

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