Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0231e4d5f982a40…

MALICIOUS

PDF

75.9 KB Created: 2021-07-02 16:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ab9cff968d119ba62d3991c54e0efe6 SHA-1: 54f552756b4329ed73e8ef2647cdede8cc4d8cf6 SHA-256: c0231e4d5f982a40cd71f354067411666dde31d976ae336116cb198873cb4957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially malicious content, likely to lure users into downloading further payloads or submitting sensitive information. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=fs+18+unlimited+money+hack
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af76948775f---73623864019.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc5a4ebe9---rarotanako.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c8ec72e349b08c49289626007c8c8070/duvaminaduraxizoribavoke.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/simf7kkatgmr87s70ribdpltg1/difeloj.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a7916b3---63241914134.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ac58a94e---59325596327.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aae1caa2a7f---fonimoxoxitowiwugetu.pdf
    • http://ibtaker.ps/userfiles/file/wepevoraxobuvemose.pdf
    • http://beveragesgs.com/userfiles/file/89942800340.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b0abc3ee---25015319452.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1a255c5d---gujanokafemimoku.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1f559384---kowelukarina.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a267675139e---90879473896.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1e039ca9ab13dbfc37620289084984c1/91569642898.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7d12d2b2b---69346837312.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0dce60cc9d6cfa2b9480d39d5d88e932/53201213764.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/87592827184.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/90k4aed6ka9abu6iau162sttv6/zutigosupidamajoxikoki.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/5903912132.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc6a35998---dujabeganesix.pdf
    • https://muratay.nl/userfiles/file/3444516741.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6861ddbe87---bonelez.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_off0000c4cf.bin
768f5dafaeceee564f18dcbf5d772ab4e1b01bffe87cd05f9d4cafe2ac9109b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 11080 bytes
font_01_sfnt_off0000de82.bin
94200af1619bd1a042f3a8c3d399c75a82195687ff4249b8f206b570c5e69863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 16704 bytes
font_02_sfnt_off00010a36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 16792 bytes

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