Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff38b35761a359b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 17:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 481622f85854d7b3dc9c19264d7df836 SHA-1: 7ffa7ad86fb708301c654315390eead5bfee9606 SHA-256: 4ff38b35761a359b22868780e7811bb31ac1cbfff6394dd33ce2651f3bc8221b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The presence of ClamAV detection and ML classification as malicious, along with heuristics identifying it as a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious intent, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1775f93b---loxos.pdf In PDF document text
    • http://www.darvidproperty.com/news/file/27794020003.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b447d12919a---fumuxexibevoko.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ik1v8a3sjj24ibtu0f9qeh9cks/82076950633.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/63906823eec78fa6f29eebe8305dd573/78911280467.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vobedunibuwevawefegew.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/wazubomo.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/wosuzawifozuna.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/34247417993.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/41066504281.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/seviwegizagemikulugexo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/61492811857.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/39254970679.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/genixiralinalinenofififi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa5be479a---33978200348.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wopuragujunufilejomeda.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae25b09b0c---zefipixavenumomovaviwene.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/95886845556.pdfIn PDF document text
    • http://aa-nusd.jp/negasafiremixer.pdfIn PDF document text
    • http://ahchala.com/img/file/20227222498.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130700569ddf---31882912405.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d779d28c386---67311419461.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9d130e7e366d5dbff38177dc8123fbb3/xuposajolisuniwifukir.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a9a57440451e7a15b1f9da65cc5f95a9/timamexapofaxot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=slow+shopping+th%C3%A9rapie+pdfPDF 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_off0000b621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 15448 bytes
SHA-256: 22b7d94c428cb582bca3f58fc778bf151c523c06cfcb5ae38fe1b9b0c512889d
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 11092 bytes
SHA-256: 29ee806d28a26445e9347b6b420ed8638ee1bbd26de6ab9e421d6d24b268309c

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