Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d6c9e221e596a7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 15:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da67c795f8a902319eb9971ae97d90e1 SHA-1: fe484dd396beafa390b3c3604d6a61c5b2494ed8 SHA-256: d4d6c9e221e596a7d5afe5a3eaf8c0ae389ab3ea456b5ff9b1cad8bd988c175f
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this lure, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ferdavagnar.is/images/fck/file/62664649607.pdf In PDF document text
    • http://clevio.biz/fckUpload/file/tetiwabezezodebaw.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/46683147776.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/59bbc63181a9c6b6b3f7d02a0e1143a9/muwogixobedaguledufiriwok.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/40639847692.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9d023f1df309264ae70bd6de2b1ea2e3/19927205865.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/mekesewudav.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xozulomikukivexagakorenef.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/73373645036.pdfIn PDF document text
    • http://erimti.com/userfiles/file/35617955627.pdfIn PDF document text
    • http://erpos.sk/data/files/larituxilulifotozoju.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/37498525280.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/94791297678.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079176fc0c---88315305475.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/masexexozubar.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/dikufu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/14181270388.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/gabazuxiguxesabigi.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/24482791772.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/4986116312.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/4567acff6ca4f4f9ed7550c784f81315.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20814fb86---83763793290.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/84522774460.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/27967706613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=farsi+font+for+androidPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 19828 bytes
SHA-256: a81dbfc66c0335eace7b034b9d9514b224fcc090a7820228f404fea7f48d527a
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 10148 bytes
SHA-256: 185f2e992c88e47175774d24f8a2b7f9abb0ee0add8a142b5287ea7e3bebd537
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.