Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06e7a9cdf6c57fa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 21:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb566ac009e07310160507cc09aec84b SHA-1: 870d5ae07a3958a197615ce503d5a75362fdeef8 SHA-256: c06e7a9cdf6c57fa65a74fd2e0866ef7510fe255e4ce6af0fd2bf2909d416231
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. Embedded JavaScript streams are present, suggesting the potential for further malicious actions like redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://haisanquangninh.org/data/dulieu/files/jolojerak.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd597ea1d---suvozudarezeralajibukubad.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/runawisevi.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/kipulam.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d410a4220d---kidefirojefigupunuxudu.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/siturabe.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/68550052344.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611991ce3d480---femupi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f07c4307a---20141892950.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/pureb.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/dalabow.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/79681587982.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6922ee08d1---ranuwivuvubas.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d43586ff---fojuxanuwudu.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7b8da4d7---jovodubikavorojezu.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/wadapafogonetu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f69a364b---55144400189.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/kotor.pdfIn PDF document text
    • http://designfromall.it/userfiles/file/defetukadilafi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/dozozozagabili.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/bawivuja.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/dufinezan.pdfIn PDF document text
    • http://fitviewer.de/files/file/84309384735.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/5512556309.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087c84894e12---diribexagasefegeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+fox+and+the+crowPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 10416 bytes
SHA-256: e246f9f86cba921249191821fb9514cb27180180b5e3e8aea09df38012252ff4
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 17484 bytes
SHA-256: 44ed5e632adbb78e9783844d9f2211e71c1cdc59de571dee9dccfc13ad7ad055

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