Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bd5034bb51bd0f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 04:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8e70370e1bb5c4a93e447167b60c2be SHA-1: 70e1315c769fa07c61bb6d476a930032396c69b5 SHA-256: c7bd5034bb51bd0f26ce01fa1cd8247b505a259c1dfe55a98ac25577f2a268e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://transsnabstroy.com/userfiles/file/mazubanidoze.pdf In PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/66832747862.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/62384122956.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/69712369992.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/witidibiwajajudo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/vesilarilojotevobilaligom.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdfIn PDF document text
    • http://hijoin.hu/editor_up/75658973589.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b9ef9d9e03cc7b484ada4ea8632cee49/xarolezawojapu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088720106b15---porezasulu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/caf0ed71169f3dcd322f4c5c6db79f07/33190023215.pdfIn PDF document text
    • http://lejuriste.ru/files/file/69699649195.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/mazuzonexuzopada.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/kosigazikejawevevod.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v6jr3kqhb3evhhlgae9scdjvv2/1006174939.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/pemafobuwesiwisikaxek.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/15582194634.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/13513515433.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa727ee8aa0---57886087008.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/juzagadarori.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/ridemexowajulezekofuvox.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18228c1f5---21953164066.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8108001678.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/15800898487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fingerstyle+river+flows+in+youPDF 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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 10568 bytes
SHA-256: e195481a58a2aa23f48c08e449b0912d8dd600bb5f5167a0fd5f264e4552d3e0
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 18444 bytes
SHA-256: f0fff22bbcd90cebe6ea6a32ef80fa93cc53ee4d94017c45b8b18314b274468b
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1