Malicious PDF — malware analysis report

Static analysis result for SHA-256 1181aca4623a73e9…

MALICIOUS

PDF

75.7 KB Created: 2021-07-30 20:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed245544eb641583d8774dc62c88024f SHA-1: e64262b46dc33d2399227bfddf4f5407fa337961 SHA-256: 1181aca4623a73e9b46f247581d6753c71c5432595eaa4a143bab61a6914b072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning tactic. The embedded URLs likely serve to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://creteotels.gr/FCKeditor/userimages/file/17204189275.pdf In PDF document text
    • http://webursitet.org/Files/file/72837399009.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/94552346341.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/70205302830.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528010412140097.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39ea99d00---xipokujaxelov.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/samoravugutodivasigerixod.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a297f4f434e08a7e4c8694d7a7ece2ad/wugarogexev.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/fd8facf48331015dfba474b563b5676e/zitodu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4aef4612092617844792e8e074fddb7b/457604985.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/jujeseseso.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/58772067163.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b59123dec8d---75775194821.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/66610828949.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/63fe241b4e8917869216e04073c62455/2567985762.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/66780992127.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/70404620078.pdfIn PDF document text
    • https://grandegroup.net/files/xiwuganenavepor.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/55988793632.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/nonenibikafafi.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/pelopujodovoregabigobojuz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3bf5bac3---70628859334.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/64484535657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=stihl+chainsaw+ms+180+service+repair+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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 15704 bytes
SHA-256: 2e21f407c550f42e8222cf127974b0c7dc6c4d0cb0f028ef4239af522b93bcb7
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 11228 bytes
SHA-256: 680890c59b5764abdd1082ccc42338889cffd79d01c1624e332b67c65a77bfa3
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1