Malicious PDF — malware analysis report

Static analysis result for SHA-256 836d6a36eb402076…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 19:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14a7ce49b9cae7fd1bd1be71f986fdb3 SHA-1: 46bb9f42e9e883522598f2c8ac631f525b751f41 SHA-256: 836d6a36eb402076ca163761ba1936c74a4b23157e92aa9585195868e322fd1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/18535065540.pdf In PDF document text
    • http://salt17.com/userfiles/files/lerokotebilax.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161301ca5d2aa4---nezesiwosekubuze.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/52914536621.pdfIn PDF document text
    • http://www.pvvc.cz/files/jeselugipurixufuxogujamu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sqs8o1dk7ucu0jmi7ipqbv2de1/xaxinetazigek.pdfIn PDF document text
    • http://beijingteye.com/upload/files/7764948107.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zudejefunusewibixiru.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/gogopugapezosajulak.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210920114753.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c5d636d---26849347625.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/90220228751.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/59526917338.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/zosalegugaralinaluxode.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d4vjeva1dr43f6tbvrsji6gbql/gamojurawevunamagila.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/50574862584.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/laver.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetudiditoliwida.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/90807345218.pdfIn PDF document text
    • http://ausafe.net/images/art/files/71784055288.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/tiwazirefikumesesumigazir.pdfIn PDF document text
    • http://elpijisystem.com/file/biluxasiguzu.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/sitorasalokabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=biggest+to+smallest+planets+in+orderPDF 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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10788 bytes
SHA-256: 672c4bad1da11809c188d1915489dfc6461668fc01577074e11e45a7ae324b66
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 18400 bytes
SHA-256: c41f2a64fd8dce0940816c5244ed5acb074e3283715250ed79525d27c96d5d8c
font_02_sfnt_off000130f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1