Malicious PDF — malware analysis report

Static analysis result for SHA-256 26eb289195c55ce4…

MALICIOUS

PDF

89.8 KB Created: 2021-07-21 07:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ed26f76c32f8ee977ae674f7a9455f3 SHA-1: b6e530e5aa0f409892a5f5c87a8715a7a4ba0f90 SHA-256: 26eb289195c55ce49ed00cf84803349be436e894bc8065ee9d2b59a2a2a35abb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cfeec5565c120ea6af45c4414e9e3d9b/piwililivub.pdf In PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/2851899799.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/nogitugutesuzorofuzub.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/84414029057.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a267ff46424---63775734973.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e075ebc3c3---85654644969.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/wibukulikakolewizugu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d967344c---24226384329.pdfIn PDF document text
    • https://isleo.com/i_photos/file/22579126760.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094265eb11dd---42610760676.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fafegalebubu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/50026616008.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad192fdf6f3---68016665323.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/wakalimozewevu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5e22d5c425b22cda7d036e179957ce98/85693035227.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/nrsnn4bj5431ovb397hm0smg21/lotirakukozije.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/58952346469.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/nugujidufaf.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f063ad185edd69e578fedf31577f7685/nufakojajo.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/widokorelejupefipope.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/70578652078.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/parufajufa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fff886d2---34351272955.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/devezuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+meaning+of+absurdityPDF 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_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 11072 bytes
SHA-256: 81a32f224addb4d42753ecc93c11251905e178adb0c5894dd5e1fc5c6d54981a
font_01_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 17832 bytes
SHA-256: 831280b94d8723f9834dc6f95f7365125b838013ed3c48062cdd2e099215f98f

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