Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a67b1f1aa9da9d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 16:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90755aef65437dcf8f7d459ab030c7d4 SHA-1: 60c7dc3a3d02d5cbeeaad8589349fb2b249bac32 SHA-256: 63a67b1f1aa9da9d0626e901705534c00e440e6f2fc661af16a4504ce6ef2c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or link farm attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=friends+season+2+episode+4+watch+online PDF link annotation
    • http://pumarecovery.com/userfiles/files/47576818914.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/pupegezufiwomirijasafi.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/89341703871.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/52tdqmr8pcfo17gck17qmq9oc5/tokituzexeliribiz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614932fa00980---61886263055.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/70391090346.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/96683561428.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/77978431800.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/fesagifufajanukakipap.pdfIn PDF document text
    • http://qdjshg.com/files/file/nerukikeveli.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/muzusipabepetalifuven.pdfIn PDF document text
    • http://arsvet.ru/img/upload/sipuvidinovoxufubaru.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/556315692.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/benurowa.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161491ef7b70d6---14339510556.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144991393b1b---gemas.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/matawaxarub.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/85328520022.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/59624627983.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/wukusutimowaji.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/7509466251.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/selipivulizalupelitegi.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fiwadoruwijepapatetu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6kbfm89gfrrr252flu5t78r607/68898400884.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_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 10872 bytes
SHA-256: 2212f5a15ceba5a43a88c57e45fdc36315a8ed7d974c8abba0c0805fd7bda968
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 18200 bytes
SHA-256: eea8eff67a00d4531f6367c52cef9661ada2f58b3254db6ad10a7ebb9b41be6a
font_02_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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