Malicious PDF — malware analysis report

Static analysis result for SHA-256 7101d453e6074211…

MALICIOUS

PDF

107.0 KB Created: 2021-06-26 18:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 428383f5518dc8b411fb9b0e830a19cb SHA-1: 9f9811371ec6d2cef8489dca839fc534669c7274 SHA-256: 7101d453e607421158877bce3f410692f562ccf4c75728aa9a434a9b6b1e53d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute or host malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091339c8384e---31462756105.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vi4h6j81u654t596ko81d4r14n/patajedigusofuwapexogevi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/foluz.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/85119452941.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b42885b2ca9---99093380321.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93ebf0a47---61222367938.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869c59acfa3---99158587102.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80b71615c---73594862369.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49371d1ec3---91692498593.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/31418143454.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210530221043196.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79b8abca1---sebutazitexisuxuludax.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/koradugujoxumudev.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/23510863106.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/n3co6vhsdf6gbcr9hvm7p5euh1/suwefolamukigepoza.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/gogajagevugikofasotujilat.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d123c85acb---16659670832.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4e4ba5a4f9988d56e0934169ee7b0877/88463986760.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/lolivo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9a0cc4da---70902403689.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dc907f3bd8cdabde19decf781772bab9/69916556716.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/745f3efdc2d24a50f0a6fbdfc73649f7/99235162769.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vgprsk1mg1h3okpj2c3v9mhdh5/sarukukigutedojo.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/58097308312.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aebe2e5ff---bafofonazazunajowagu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/403d617b1fcb03fc0bbdc814d2f2ddd9/fabijava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=skrillex+scay+onster+an+nice+sprites+midiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 18528 bytes
SHA-256: f56b69064817602e6fd0fd884862f4a34cb4f3790a12d11bc570a79422b09142
font_01_sfnt_off00014747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14747 11056 bytes
SHA-256: 463477f18aa7bef4320a2b7631a6a7d664e5b946608d3a75ae7e7e94d6a210db
font_02_sfnt_off0001610a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001791b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791B 16228 bytes
SHA-256: 3bfb0e0d3ba5850914d9297b5da8bfa3578edd44010fb6cdd55106c6e0393f3b
font_04_sfnt_off00018ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ED2 3148 bytes
SHA-256: ba93a7826cbf9d5b6c3715115659ff796bf33ccb958b2ba7b9b6d77745e3bf49