Malicious PDF — malware analysis report

Static analysis result for SHA-256 8babffed6419d5ad…

MALICIOUS

PDF

100.0 KB Created: 2021-09-02 22:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c03bf9ccc8c3008115109b0b6ba1e59f SHA-1: df16321f854e91e2aa6ed130356832df3f0af48a SHA-256: 8babffed6419d5adafebda50295750d0eb5e308c6aebb09a2cbb04e1580d548c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thingstodobahrain.net/ckfinder/userfiles/files/24227095625.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa392a587b---57083906111.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/41854834129.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/99682154772.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/20aaaa82c484a445a024b22fb54bffae/18342797656.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/jinivomivizozagariwawuw.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54157386810.pdfIn PDF document text
    • http://xycrusher.com/d/files/jikafolugobukemufaziriwek.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bivola.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zevagejevalusaw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f46bfa7---51237696423.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/32173568496.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/vinuzuturumuroropi.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/kubizisopen.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3d05f752e01b0b607206de23425f5a0a/basebulonogo.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/xitip.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/9201939289.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/96008840369.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/gomirefafika.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/birodonejawow.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086d52e733d2---vetemabunewuvupoxu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160873cd62427b---55810458870.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a521c3fe---kafurevixiwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=total+comfort+cool+mist+ultrasonic+humidifier+manualPDF 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_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 20196 bytes
SHA-256: 5ed92e76dc3981612f3dfedaa25869455d15094f258e903b7938c31bbf79c636
font_02_sfnt_off00016907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16907 10804 bytes
SHA-256: fc46adf8f94f284d96a264555efe87420679490c7353a028a6f23ba8bd8c9772

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