Malicious PDF — malware analysis report

Static analysis result for SHA-256 23caaa833bdee8eb…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 06:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ae7e61ccd1b0d1203dbad29dc82aade SHA-1: 6ced9a7cfe45f456d75a0679227a06eb452ad600 SHA-256: 23caaa833bdee8eba9d4b2ade6539948a1c44e18f6383946249d61c9f2b2f587
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, some of which are compromised WordPress sites, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=time+spent+on+my+phone PDF link annotation
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/bamogidosixijepon.pdfIn PDF document text
    • https://ksboutlet.com/file/files/suvipe.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/tubitubu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/65192841472.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/zipamajivowemifulufewese.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/33403218102.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/11778270426.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/vewazetonidu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f47d9bb09f---53413144202.pdfIn PDF document text
    • http://lecostationery.com/files/file/manezewo.pdfIn PDF document text
    • https://music-group-store.com/upload/files/56947322679.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/246tdvtkdah24nbhpknhkbo56a/vanovejikopegil.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/vogesakez.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/jipixevazekekipe.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/6003678273.pdfIn PDF document text
    • http://happy-land.hu/editor_up/31805159297.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/55942477080.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdd769cf8---xidegijaba.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/39995206625.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210909/file/1631188649.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bdvlb9a2p4q7v5jo445pot28j9/kizikisivokosokedanumik.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/lokixaritefiwino.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-10/210910184013704500or8r19gs5ti1.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477f632ea06---33052605269.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/mimori.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_off0000b969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 17496 bytes
SHA-256: 0bf2234e1722c6df2661e387e4017fe7db9e4b3a4e6bd271de144d6dc9f7348e
font_02_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 10284 bytes
SHA-256: d46aa6c0df28bce58ec22f02702e758da1b13b3a215088bfbba5d2e82355163a

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