Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5f33aa1fcc5a06…

MALICIOUS

PDF

103.2 KB Created: 2021-06-17 21:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 245017a8efd8df5d5a916b6a594e50b8 SHA-1: 5c298544919ce1fe0998587101656777ea537466 SHA-256: bb5f33aa1fcc5a06ae26987b44382c780201c2e11011d4160d9b6565d1709914
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or scam-related objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c7c5b459e---46321147963.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9cid78pc8ruj0jaigmkkj4op94/39524047773.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756991e4d11---56822835091.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac88bee1f69---wifipewapetigimejuso.pdfIn PDF document text
    • https://olterus.com/contents//files/dufofomudipik.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbf5163d4---vasaxezesedapa.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ftah4ad5i846qt6pcd2ftkk1fb/61186617874.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/kiuo4tqls41vlmtci1qka228f6/zupoxemometesokibe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3445b99e25b931de633833e56400f4c6/lubimiguduzut.pdfIn PDF document text
    • http://ausafe.net/images/art/files/70831121593.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a22ad35a---38813233821.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/firuxalilemabo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/44904716829.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/46064675272.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/sadolajufu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082473a3d6d3---52861041422.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a6689c82---rizerirokupalexelix.pdfIn PDF document text
    • http://hkalc.com/userfiles/zezuvibarofozub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fortnite+egirl+discordPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 4852 bytes
SHA-256: 0ee68061d384d8a2cfed46b4d1103e4dca8f122e6c845470785658dfcb21df2f
font_01_sfnt_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 5040 bytes
SHA-256: 24880eb2bf45bd1e81c35f6bb59148d5373d2b886cf4d46aa49fd9f7f5cfd39a
font_02_sfnt_off00014c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 13532 bytes
SHA-256: cd769ae663c129ef2ac283e753d8584cc7ffedf8d73cc4986c8f2dc63fdc786f
font_03_sfnt_off0001796f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796F 16300 bytes
SHA-256: babf4c400110b85ccc4834f01f547d276ab6529d5bd6c420b4a75b420e9c42f3

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