Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1bf5881f5c4718…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 02:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f422336139cfa935d03c578ef70e38a5 SHA-1: a9cfd67c8b336b38a66f2b17c3fc23b01771c222 SHA-256: 9b1bf5881f5c4718d7da5a89acc7a016de712a576fb11d5f0d423da388b61903
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious JavaScript. The document functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=scantronic+9427+style+alarm+manual PDF link annotation
    • http://slsnn.ru/content/file/kekofafogelarel.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a956d56b---24755643836.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tejifawabaririwavuluma.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/ruwunufifivina.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xeforonez.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/91051718651.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d4de7dd3---zakuputilawikarobisun.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2bd64788cf504452acb5cc00dd324454/migowese.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/89b8geafi7ooe0abh8a8pqn2ke/90756745194.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xizasil.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/zixezonesujozimufopafovoz.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3a0685b588e33cf770c048bcb8c9f14a/kitudigowi.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/ribetelekitovusamegediwi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/93lfdkltobbou4cmo9v71r29lh/71421898590.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7ecc38bf889c5dee21f46cb904175480/femigodorukemufuvutuf.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/relovimitipi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a85267025a2---27181833969.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/lirogotike.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f29c65f19d6---6236097960.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160790f5978f6b---zivanekovalo.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/55015677884.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fudalojepevuj.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/39et28rpahs4b6t6re72ut6oq4/38965049564.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/dukusixalolofofarali.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 11096 bytes
SHA-256: 2bda9ea9fb1c608af3cefe4d6f85677bdfaf6db60848b86ec6bf28e3ca520f81
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 17952 bytes
SHA-256: 8c3e4394ba372165c3a8d6351af22f82f4953e69dae653d4b2ee74c3cf86ff66
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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