Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbddaea23943b605…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 12:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7f0345a97afbde47cada2c3dcf921eda SHA-1: 930db0a130b3b951ea7e6b1cef4b897a19e25350 SHA-256: cbddaea23943b605c844b3e107118a1e19d2cc1404149b300eb8f1028641f9cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to redirect users to external sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7261

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=online+pdf+to+ppt+converter+free+download+full+version PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f032cd7c0d---doxap.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/93384862747.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/dukili.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6be58d53a---xizifelogov.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae4780f2---gijogitize.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c5d99b1b55cb2cce1caa35648f2dbccb/guzefale.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9713b1ddaf3db510473a2885831f9d08/falafubulipajebojafak.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/basodomibababav.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/b7rsonrkgli9fln701febm8qak/sededadakememegisivav.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de0a840bd---jozikonawuxevuzumaladu.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fa743aa985367c6a09afc3ff87a9c3e6/44858291212.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/13231832969.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tijuratopuvipururaf.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/71076224991.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddbc380c5d---21083377052.pdfIn PDF document text
    • https://southafricapools.com/contents/files/51981458417.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/rotemopasabareleleb.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wibimig.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tovilamobiduwuwaf.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/8395234023.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c5d0ba5e---pezadezivamojulikur.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/gubasuluxagomojud.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c28e37e7---47165056496.pdfIn 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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 10888 bytes
SHA-256: 7e976b48cc844f11631968729e955882bfc9e2807d85832a7dd2f390f0d202cb
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16948 bytes
SHA-256: d146c1dd2469520238658aa3381fce7c243b575ae64e5286f8b928940e75edad
font_02_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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