Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e687ff1386e36f…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 21:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54a2e82266880043dc2bb89c0672726b SHA-1: a435c98fb9d0cb43b4df7fe82989cc5274e4060c SHA-256: b0e687ff1386e36f6dc6af511fb5af33b962f8e9019be144643fe4f883dd7e22
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://zatoodesign.com/userfiles/files/18696549128.pdf In PDF document text
    • http://rjt1.org/upload/files/87743174285.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vesutakosal.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fogolonekotobap.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/93963822937.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8d92e90a---pesiwesinatosenofij.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/turodopexufe.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/81457689460.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3192e81056---sasikuzipo.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/dawejozerotozamijat.pdfIn PDF document text
    • http://saglikligencler.org/files/files/60571559853.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbf1becb24---10530599132.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b72525705---51351104727.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nobiroxurigofa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b34ebee5---zezilelekamolinetezameko.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/nobegofozul.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/89344477111.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/komebubeferapiguza.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bovabepozomonoxudotap.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/82398451653.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/81419607863.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zopofinegoreseka.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f56e33aaa---52287015729.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/9192260790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kenwood+bm200+bread+maker+instruction+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_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 11180 bytes
SHA-256: 4521b43b0891894310ebff804c3727be52f6143a2ead10b9c9db86c311dd591a
font_02_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 18520 bytes
SHA-256: 2d4c119a1950ee39f912bbb14749092fadb7554d5767d3061029125296da1cd6

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