Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8352cdae686b3e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 17:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfb1a5f6ee289a4059cc5234a5c92e11 SHA-1: 618d875588604ee174dff26f20689ea6c8039586 SHA-256: 1e8352cdae686b3e2468ecebcc203fcc533f7bb38e1e922db291882dd17f9284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/73b161336bb97273f92eec6bd547ce8d/50616633279.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/nujimanulivimigifaset.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908070038_300662726.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161413f2fe11f6---55122949951.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitotefufubazojulo.pdfIn PDF document text
    • http://c-amc.com/upload/files/zimazuwepawabapo.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/38236372258.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/wurefap.pdfIn PDF document text
    • https://empresa-venta.hr/files/87461509380.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/gajewexusujaxaxegixipifu.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/xojobewaroduporix.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0759fadf5ad8de0c12dab2e4fb89ce8b/59222245225.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tomajikivika.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/gepisobanugatukeni.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139edd2eb6c7---febovatixubixukisene.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/75418932029.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/76967228116.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/638e4cbfc3a691e5c67921b7db0e5b28/50120547490.pdfIn PDF document text
    • http://fitviewer.com/files/file/tezowupexivogokebap.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/74466524784.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/rovapenizudunuzuvexe.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/27604752081.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/94792857985.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/3957778504.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93d92699c---rexolurab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=city+of+heavenly+fire+read+onlinePDF 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 16992 bytes
SHA-256: 0e40472b8ae3b9072154f4539fcf4f55016bc344687c088ea871a070f5bcd616
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 10496 bytes
SHA-256: b0ab8e1498cdccf3cf60c96af66bfb61292aa04206355393d6e211f28a947c56
font_02_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1