Malicious PDF — malware analysis report

Static analysis result for SHA-256 366c566f570a1760…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 17:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc554c8baa829543b6f28d9277e80664 SHA-1: 0dbcae1c602d4b56a7f567c40d077a493b12e1be SHA-256: 366c566f570a1760d1278a3bf5c9578250121630f15edeb5d869e20f2dfd41cb
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF itself appears to be malformed or obfuscated, with no readable document body content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://reutlinger.pl/userfiles/file/jogujep.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607319eb3e296---gutigowitoxetopapiba.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4bc4cd42---55576156321.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5b2ddebed57c67e6d79741d12d10f04b/50596228837.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b677c3b9---27425435592.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b33e6eef8---bawokisow.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/p4d6vutvo3i5an4o2b8voi16s0/lelukamuwepum.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5e46c3c6d95e3bdc556c1df2834bc8dc/fixavifa.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/nukasedowogunonejijuvi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d45bcce8b46---xemetokekowejudo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b983ae30---97308645212.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c99e0ea80cf77c8d2d03cb56b121d57b/maxub.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/71666261262.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e133bb14---35173486929.pdf
    • http://119hero.kr/userData/board/file/91385093913.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee7d8cf7d---37008705318.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69067c6be---74520611295.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/nejokovuxotarufejeba.pdf
    • https://x-software.cz/data/file/nefisagetibab.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810797de19e---zimirulego.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cj6qmgj4gav872nvnuuv38fdic/ludinosokezezunaxidamadiw.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7439c49e---kajenodusitepejixamadal.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/76972455521.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=choosing+and+using+astronomical+eyepieces+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5a.bin
1064637b67001ffed50d624945449260de7e5e031da313b781d37d87a7ef4a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 11312 bytes
font_01_sfnt_off000124a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16792 bytes
font_02_sfnt_off00013cbb.bin
ad067535055f8077fce17ced172366cae01c84c62283d4549a6d3c9c41b88794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 18608 bytes

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