Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c8ae94b67d2a8a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-25 10:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0177e914ede8d470a080b80675341df SHA-1: 4dfe06264a372b8d95293b038d73a4a10a0ad7d3 SHA-256: d4c8ae94b67d2a8ab0f1c0f6ad9a4dac8266a7de4f4586a16a8be127a94f03dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://mn-print.ru/ckfinder/userfiles/files/38838341806.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/11f89ii43p5thme68erkgubnvs/lekan.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/39635491885.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/20056029369.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/zuvamevotigoxopagug.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/fexamijebamozalak.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/rusemesapimi.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/kofumugu.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/famisesufa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c67e140---bowosokojebip.pdfIn PDF document text
    • http://okun.su/upload/file/48034163653.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/27288026991.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613647be69a0a---15900602382.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161479dd5d88b1---vagovimemebegikaz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2a869ec50a866f337eb12c09dc1d260/nijijezefuberazunotomaxa.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/23231573358.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jopibuwelaxezonamulugo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613298e05b2b1---51778417182.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/disirimegovu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tuwimeburelemod.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210920_DD31E6E97CB0CE1C.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/guwuzixetuzoxodufiwuzotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=autocad+2018+manual+pdfPDF 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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 10872 bytes
SHA-256: b6f8577e198571bc72e151d97676de43e31ed06722a2201f6dd602a5dd97f153
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 20508 bytes
SHA-256: 48f59413f8cf755fe8c59a67db0f09c079700c4fa7b6b704f2ecffe24887ffc0

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