Malicious PDF — malware analysis report

Static analysis result for SHA-256 3763c1d1a178b378…

MALICIOUS

PDF

79.5 KB Created: 2021-08-12 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efe715152fd7054823498ea2d03b1a6e SHA-1: 8457e21bb6efe783c3c2097d72c73837403e12e2 SHA-256: 3763c1d1a178b378766b4992875b5c8455ceecef5d3caba92485d56534bb962a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attack pattern involving the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2df1c41b974a407c7bfb532b54339f74/56814273609.pdf In PDF document text
    • http://homeopathyhongkong.cn/files/ninofanopafeloxuxol.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/sigavosesi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vlcc529id4a1v968cgc6c0jav9/57347456963.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/vitevirabilekuwafitu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607824d66bdb9---lukere.pdfIn PDF document text
    • http://gerocuki.hu/user/file/73282201961.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32497521072.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181054.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3t67k3vud5g548shuumpsl5h8e/50989447755.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/lufudogosufe.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/80326456848.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ae25b909---60919737734.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f1975e6a---99602304252.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/defadovoxafofuvoza.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/19037278160.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/85816490814.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jolewojedupejatavazugatun.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/da76e2cb9a1efc91f1388a01f06c6273/sadaberizopemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+cut+acrylic+sheets+with+knifePDF 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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 10816 bytes
SHA-256: ff37505c579c04bdf15cd25923296573d7b5db425396f30e1c000f9e0fb708b1
font_01_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 17016 bytes
SHA-256: 4df955d9833d2e567174873d4bc726be4c2619f2ed8bff297c89c4dc60377d86
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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