Malicious PDF — malware analysis report

Static analysis result for SHA-256 4362fe326b710ddb…

MALICIOUS

PDF

71.4 KB Created: 2021-10-07 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f77370797419922bbe0ca35a2d07962 SHA-1: fe14f0ea7d836e09e58d21c25c255310351ef28b SHA-256: 4362fe326b710ddbceac1c1c8275a2b001adc11f7c370d2128f075f408ae4032
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://springfordfarm.com/sites/default/files/uploads/file/dilupuguredo.pdf In PDF document text
    • http://makaroma.fr/upload/file/88794138921.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/90914865761.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091705192273499.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18f21eddc985cffb7681bd579b965711/jureropukugoji.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85741ce47---87018584722.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/34950539686.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/jumixawixubevi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb86dd93---metemozatokeveguvo.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/xojixebesikarabanawof.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/62946298840.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/62174742931.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/vapidemowa.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/8670420241.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/pivovurojijebanosabirifox.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a22d8b46a1---nuxijetawilesizivivel.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4547fdc4---wixurirutugetiw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161558847cab72---laxupijafibapukureza.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/tijaxugezemetorowimelusu.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/68726315251.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/79740399187.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/68931724407.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161559dc937814---17892319373.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e23bd2701b28b4eb529169eacf17eea/15705986019.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/turotureronege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=japanese+question+markPDF 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 10696 bytes
SHA-256: ff973bb865dfda1a24ecb4b03d9b15cd5ee9078a0a29c136fc491364134ef7e6
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16824 bytes
SHA-256: 2a4934fb050750e72cb8eb774dd29f53921809c955882d0102ffab249da6f674
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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