Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d02b896525aa55a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 23:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a3f13398af009da7b9115c6dec69bd2 SHA-1: 0fb547cedae2d26ecaf72d859db946d9c81f2900 SHA-256: 0d02b896525aa55a1c857f7bf14786126c383e385e8d47b2bfa1c59e8e41b925
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to various disposable hosting sites, some of which are compromised WordPress uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chip-chup.hu/upload/file/xopatosezogibubosed.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfa8c7ad1---lobakolujor.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/90f36e49c3b975242510408bcffd0215/57273456960.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/difeporogu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613843d08acb1---zogad.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/81980997710.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9idhq59qa458f2ahql6541fg80/12277697675.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/kodukokofofulesapukow.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/49014759946.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131134a2a779---lalobud.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13457370210.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b8e0d7384cb919f392c53822a880f468/89905141315.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/koratesadodane.pdfIn PDF document text
    • https://baongochoa.com/upload/file/557555482.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/zatawabavurubule.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded2e74310---84496881634.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/bonejatareno.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/duruzakamijun.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74248264619.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/6900039073.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/kuwebudufajovejux.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/rebepufunaxuruxixijusano.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/vajorufebipezisej.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/30648605505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=comment+enregistrer+une+conversation+sms+sur+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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 10864 bytes
SHA-256: 478d2254536443b3b8e2f89c533022e77644ecee0b644f9201f6806386dd5ba1
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 22260 bytes
SHA-256: 0f4d9d47d7b5ddff270a6c442452f2b0c95b33aeaadd32744ac15fe2eb113c3d
font_02_sfnt_off00013d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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